Compare 666 vs 667
| Property | 666 | 667 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 4 | 2 |
| Prime factorization | 21 × 32 × 371 | 231 × 291 |
| Prime factorization | 2 × 3 × 3 × 37 | 23 × 29 |
| Divisors count | 12 | 4 |
| Divisors | 1, 2, 3, 6, 9, 18, 37, 74, 111, 222, 333, 666 | 1, 23, 29, 667 |
| Number of properties | 0 | 1 |
| Semiprimes | 199th | |
| Roman numberals | DCLXVI | DCLXVII |
| Base 2 | 10100110102 | 10100110112 |
| Base 3 | 2202003 | 2202013 |
| Base 4 | 221224 | 221234 |
| Base 5 | 101315 | 101325 |
| Base 6 | 30306 | 30316 |
| Base 7 | 16417 | 16427 |
| Base 8 | 12328 | 12338 |
| Base 9 | 8209 | 8219 |
| Base 10 | 66610 | 66710 |
| Base 11 | 55611 | 55711 |
| Base 12 | 47612 | 47712 |
| Base 13 | 3c313 | 3c413 |
| Base 14 | 35814 | 35914 |
| Base 15 | 2e615 | 2e715 |
| Base 16 | 29a16 | 29b16 |