Mathematics Large number

Multiples of bytes
Decimal Value Metric 1000 kB kilobyte 10002 MB megabyte 10003 GB gigabyte 10004 TB terabyte 10005 PB petabyte 10006 EB exabyte 10007 ZB zettabyte 10008 YB yottabyte	Binary Value JEDEC IEC 1024 KB kilobyte KiB kibibyte 10242 MB megabyte MiB mebibyte 10243 GB gigabyte GiB gibibyte 10244 - - TiB tebibyte 10245 - - PiB pebibyte 10246 - - EiB exbibyte 10247 - - ZiB zebibyte 10248 - - YiB yobibyte

Large Numbers

Number	SI Prefix	Symbol	Description (Short Scale)	Description (Long Scale)
1,000,000,000,000,000,000,000,000,000	???	e^27	Octillion	Quadrilliard
1,000,000,000,000,000,000,000,000	yotta	Y	Septillion	Quadrillion
1,000,000,000,000,000,000,000	zetta	Z	Sextillion	Thousand Trillion/Trilliard
1,000,000,000,000,000,000	exa	E	Quintillion	Trillion
1,000,000,000,000,000	peta	P	Quadrillion	Thousand Billion/Billiard
1,000,000,000,000	tera	T	Trillion	Billion
1,000,000,000	giga	G	Billion	Thousand Million/Milliard
1,000,000	mega	M	Million	Million
1,000	kilo	k	Thousand	Thousand
100	hecto	h	Hundred	Hundred
10	deca	da	Ten	Ten>

Small Numbers

Number	SI Prefix	Symbol	Description (Short Scale)	Description (Long Scale)
0.1	deci	d	Tenth	Tenth
0.01	centi	c	Hundredth	Hundredth
0.001	milli	m	Thousandth	Thousandth
0.000 001	micro	u	Millionth	Millionth
0.000 000 001	nano	n	Billionth	Thousand Millionth
0.000 000 000 001	pico	p	Trillionth	Billionth
0.000 000 000 000 001	femto	f	Quadrillionth	Thousand Billionth
0.000 000 000 000 000 001	atto	a	Quitillionth	Trillionth
0.000 000 000 000 000 000 001	zepto	z	Sextillionth	Thousand Trillionth
0.000 000 000 000 000 000 000 001	yocto	y	Septillionth	Quadrillionth

Metric prefixes

Prefix Symbol 1000m 10n Decimal English word Since[n 1] short scale long scale yotta Y  10008  1024 1000000000000000000000000  septillion  quadrillion 1991 zetta Z  10007  1021 1000000000000000000000  sextillion  thousand trillion 1991 exa E  10006  1018 1000000000000000000  quintillion  trillion 1975 peta P  10005  1015 1000000000000000  quadrillion  thousand billion 1975 tera T  10004  1012 1000000000000  trillion  billion 1960 giga G  10003  109 1000000000  billion  thousand million 1960 mega M  10002  106 1000000             million 1960 kilo k  10001  103 1000             thousand 1795 hecto h  10002/3  102 100             hundred 1795 deca da  10001/3  101 10             ten 1795  10000  100 1             one – deci d  1000−1/3  10−1 0.1             tenth 1795 centi c  1000−2/3   10−2 0.01             hundredth 1795 milli m  1000−1  10−3 0.001             thousandth 1795 micro µ  1000−2  10−6 0.000001             millionth 1960 nano n  1000−3  10−9 0.000000001  billionth  thousand millionth 1960 pico p  1000−4  10−12 0.000000000001  trillionth  billionth 1960 femto f  1000−5  10−15 0.000000000000001  quadrillionth  thousand billionth 1964 atto a  1000−6  10−18 0.000000000000000001  quintillionth  trillionth 1964 zepto z  1000−7  10−21 0.000000000000000000001  sextillionth  thousand trillionth 1991 yocto y  1000−8  10−24  0.000000000000000000000001  septillionth  quadrillionth  1991

Base -illion (short scale)	Value	U.S., Canada and modern British (short scale)	Traditional British (long scale)	Traditional European (Peletier) (long scale)	SI Symbol	SI Prefix
1	106	Million	Million	Million	M	Mega-
2	109	Billion	Thousand million	Milliard	G	Giga-
3	1012	Trillion	Billion	Billion	T	Tera-
4	1015	Quadrillion	Thousand billion	Billiard	P	Peta-
5	1018	Quintillion	Trillion	Trillion	E	Exa-
6	1021	Sextillion	Thousand trillion	Trilliard	Z	Zetta-
7	1024	Septillion	Quadrillion	Quadrillion	Y	Yotta-
8	1027	Octillion	Thousand quadrillion	Quadrilliard
9	1030	Nonillion	Quintillion	Quintillion
10	1033	Decillion	Thousand quintillion	Quintilliard
11	1036	Undecillion	Sextillion	Sextillion
12	1039	Duodecillion	Thousand sextillion	Sextilliard
13	1042	Tredecillion	Septillion	Septillion
14	1045	Quattuordecillion	Thousand septillion	Septilliard
15	1048	Quinquadecillion	Octillion	Octillion
16	1051	Sedecillion	Thousand octillion	Octilliard
17	1054	Septendecillion	Nonillion	Nonillion
18	1057	Octodecillion	Thousand nonillion	Nonilliard
19	1060	Novendecillion	Decillion	Decillion
20	1063	Vigintillion	Thousand decillion	Decilliard
21	1066	Unvigintillion	Undecillion	Undecillion
22	1069	Duovigintillion	Thousand undecillion	Undecilliard
23	1072	Tresvigintillion	Duodecillion	Duodecillion
24	1075	Quattuorvigintillion	Thousand duodecillion	Duodecilliard
25	1078	Quinquavigintillion	Tredecillion	Tredecillion
26	1081	Sesvigintillion	Thousand tredecillion	Tredecilliard
27	1084	Septemvigintillion	Quattuordecillion	Quattuordecillion
28	1087	Octovigintillion	Thousand quattuordecillion	Quattuordecilliard
29	1090	Novemvigintillion	Quindecillion	Quindecillion
30	1093	Trigintillion	Thousand quindecillion	Quindecilliard
31	1096	Untrigintillion	Sedecillion	Sedecillion
32	1099	Duotrigintillion	Thousand sedecillion	Sedecilliard
33	10102	Trestrigintillion	Septendecillion	Septendecillion
34	10105	Quattuortrigintillion	Thousand septendecillion	Septendecilliard
35	10108	Quinquatrigintillion	Octodecillion	Octodecillion
36	10111	Sestrigintillion	Thousand octodecillion	Octodecilliard
37	10114	Septentrigintillion	Novendecillion	Novendecillion
38	10117	Octotrigintillion	Thousand novendecillion	Novendecilliard
39	10120	Noventrigintillion	Vigintillion	Vigintillion
40	10123	Quadragintillion	Thousand vigintillion	Vigintilliard
50	10153	Quinquagintillion	Thousand quinquavigintillion	Quinquavigintilliard
60	10183	Sexagintillion	Thousand trigintillion	Trigintilliard
70	10213	Septuagintillion	Thousand quinquatrigintillion	Quinquatrigintilliard
80	10243	Octogintillion	Thousand quadragintillion	Quadragintilliard
90	10273	Nonagintillion	Thousand quinquaquadragintillion	Quinquaquadragintilliard
100	10303	Centillion	Thousand quinquagintillion	Quinquagintilliard
101	10306	Uncentillion	Unquinquagintillion	Unquinquagintillion
102	10309	Duocentillion	Thousand unquinquagintillion	Unquinquagintilliard
103	10312	Trescentillion	Duoquinquagintillion	Duoquinquagintillion
110	10333	Decicentillion	Thousand quinquaquinquagintillion	Quinquaquinquagintilliard
111	10336	Undecicentillion	Sesquinquagintillion	Sesquinquagintillion
120	10363	Viginticentillion	Thousand sexagintillion	Sexagintilliard
121	10366	Unviginticentillion	Unsexagintillion	Unsexagintillion
130	10393	Trigintacentillion	Thousand quinquasexagintillion	Quinquasexagintilliard
140	10423	Quadragintacentillion	Thousand septuagintillion	Septuagintilliard
150	10453	Quinquagintacentillion	Thousand quinquaseptuagintillion	Quinquaseptuagintilliard
160	10483	Sexagintacentillion	Thousand octogintillion	Octogintilliard
170	10513	Septuagintacentillion	Thousand quinquaoctogintillion	Quinquaoctogintilliard
180	10543	Octogintacentillion	Thousand nonagintillion	Nonagintilliard
190	10573	Nonagintacentillion	Thousand quinquanonagintillion	Quinquanonagintilliard
200	10603	Ducentillion	Thousand centillion	Centilliard
300	10903	Trecentillion	Thousand quinquagintacentillion	Quinquagintacentilliard
400	101203	Quadringentillion	Thousand ducentillion	Ducentilliard
500	101503	Quingentillion	Thousand quinquagintaducentillion	Quinquagintaducentilliard
600	101803	Sescentillion	Thousand trecentillion	Trecentilliard
700	102103	Septingentillion	Thousand quinquagintatrecentillion	Quinquagintatrecentilliard
800	102403	Octingentillion	Thousand quadringentillion	Quadringentilliard
900	102703	Nongentillion	Thousand quinquagintaquadringentillion	Quinquagintaquadringentilliard
1000	103003	Millinillion	Thousand quingentillion	Quingentilliard

Binary prefixes

The International System of Quantities (ISQ) defines a series of prefixes denoting integer powers of 1024 between 1024¹ and 1024⁸.

Power	Value	ISQ Symbol	ISQ Prefix
1	10241	Ki	Kibi-
2	10242	Mi	Mebi-
3	10243	Gi	Gibi-
4	10244	Ti	Tebi-
5	10245	Pi	Pebi-
6	10246	Ei	Exbi-
7	10247	Zi	Zebi-
8	10248	Yi	Yobi-