Large numbers
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| American | European | Math |
| thousand | thousand | 103 = 1,000 |
| million | million | 106 = 1,000,000 |
| billion | thousand million | 109 = 1,000,000,000,000 |
| trillion | billion | 1012 = 1,000,000,000,000,000 |
| quadrillion | thousand billion | 1015 = 1,000,000,000,000,000,000 |
| quintillion | ? | 1018 = 1,000,000,000,000,000,000,000 |