Compare 665 vs 666
| Property | 665 | 666 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 3 | 3 |
| Total factors | 3 | 4 |
| Prime factorization | 51 × 71 × 191 | 21 × 32 × 371 |
| Prime factorization | 5 × 7 × 19 | 2 × 3 × 3 × 37 |
| Divisors count | 8 | 12 |
| Divisors | 1, 5, 7, 19, 35, 95, 133, 665 | 1, 2, 3, 6, 9, 18, 37, 74, 111, 222, 333, 666 |
| Number of properties | 0 | 0 |
| Roman numberals | DCLXV | DCLXVI |
| Base 2 | 10100110012 | 10100110102 |
| Base 3 | 2201223 | 2202003 |
| Base 4 | 221214 | 221224 |
| Base 5 | 101305 | 101315 |
| Base 6 | 30256 | 30306 |
| Base 7 | 16407 | 16417 |
| Base 8 | 12318 | 12328 |
| Base 9 | 8189 | 8209 |
| Base 10 | 66510 | 66610 |
| Base 11 | 55511 | 55611 |
| Base 12 | 47512 | 47612 |
| Base 13 | 3c213 | 3c313 |
| Base 14 | 35714 | 35814 |
| Base 15 | 2e515 | 2e615 |
| Base 16 | 29916 | 29a16 |