The folowing table expresses '660' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR10 | DR9 | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 1010010100 | 100 | 1 | |||||||
| 3 | 220110 | 20 | 2 | |||||||
| 4 | 22110 | 12 | 3 | |||||||
| 5 | 10120 | 4 | ||||||||
| 6 | 3020 | 5 | ||||||||
| 7 | 1632 | 15 | 6 | |||||||
| 8 | 1224 | 11 | 2 | |||||||
| 9 | 813 | 13 | 4 | |||||||
| 10 | 660 | 12 | 3 | |||||||
| 11 | 550 | A | ||||||||
| 12 | 470 | B | ||||||||
| 13 | 3BA | 1B | C | |||||||
| 14 | 352 | A | ||||||||
| 15 | 2E0 | 11 | 2 | |||||||
| 16 | 294 | F |
Factors: 22 * 3 * 5 * 11
660 is in the Pythagorean Triples: (259, 660, 709), (660, 989, 1189), (660, 779, 1021).