Denominations above one million
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US system
Name | Value in powers of ten | Number of zeros |
Number of groups of three zeros after 1000 |
billion | 109 | 9 | 2 |
trillion | 1012 | 12 | 3 |
quadrillion | 1015 | 15 | 4 |
quintillion | 1018 | 18 | 5 |
sextillion | 1021 | 21 | 6 |
septillion | 1024 | 24 | 7 |
octillion | 1027 | 27 | 8 |
nonillion | 1030 | 30 | 9 |
decillion | 1033 | 33 | 10 |
undecillion | 1036 | 36 | 11 |
duodecillion | 1039 | 39 | 12 |
tredecillion | 1042 | 42 | 13 |
quattuordecillion | 1045 | 45 | 14 |
quindecillion | 1048 | 48 | 15 |
sexdecillion | 1051 | 51 | 16 |
septendecillion | 1054 | 54 | 17 |
octodecillion | 1057 | 57 | 18 |
novemdecillion | 1060 | 60 | 19 |
vigintillion | 1063 | 63 | 20 |
centillion | 10303 | 303 | 100 |
British system
Name | Value in powers of ten | Number of zeros | Powers of 1 000 000 |
milliard | 109 | 9 | — |
billion | 1012 | 12 | 2 |
trillion | 1018 | 18 | 3 |
quadrillion | 1024 | 24 | 4 |
quintillion | 1030 | 30 | 5 |
sextillion | 1036 | 36 | 6 |
septillion | 1042 | 42 | 7 |
octillion | 1048 | 48 | 8 |
nonillion | 1054 | 54 | 9 |
decillion | 1060 | 60 | 10 |
undecillion | 1066 | 66 | 11 |
duodecillion | 1072 | 72 | 12 |
tredecillion | 1078 | 78 | 13 |
quattuordecillion | 1084 | 84 | 14 |
quindecillion | 1090 | 90 | 15 |
sexdecillion | 1096 | 96 | 16 |
septendecillion | 10102 | 102 | 17 |
octodecillion | 10108 | 108 | 18 |
novemdecillion | 10114 | 114 | 19 |
vigintillion | 10120 | 120 | 20 |
centillion | 10600 | 600 | 100 |
Note: To avoid ambiguity, the US system of naming these denominations is increasingly being adopted in Australia and elsewhere in the world, including Britain.