Compare 1657 vs 1666
| Property | 1657 | 1666 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 4 |
| Prime factorization | 16571 | 21 × 72 × 171 |
| Prime factorization | 1657 | 2 × 7 × 7 × 17 |
| Divisors count | 2 | 12 |
| Divisors | 1, 1657 | 1, 2, 7, 14, 17, 34, 49, 98, 119, 238, 833, 1666 |
| Number of properties | 8 | 0 |
| Additive primes | 139th | |
| Cuban primes 1 | 12th | |
| Emirps | 80th | |
| Isolated primes | 157th | |
| Primes | 260th | |
| Pythagorean primes | 125th | |
| Sexy primes (1st member) | 112th | |
| Sexy prime triplets (1st member) | 43rd | |
| Roman numberals | MDCLVII | MDCLXVI |
| Base 2 | 110011110012 | 110100000102 |
| Base 3 | 20211013 | 20212013 |
| Base 4 | 1213214 | 1220024 |
| Base 5 | 231125 | 231315 |
| Base 6 | 114016 | 114146 |
| Base 7 | 45557 | 46007 |
| Base 8 | 31718 | 32028 |
| Base 9 | 22419 | 22519 |
| Base 10 | 165710 | 166610 |
| Base 11 | 127711 | 128511 |
| Base 12 | b6112 | b6a12 |
| Base 13 | 9a613 | 9b213 |
| Base 14 | 86514 | 87014 |
| Base 15 | 75715 | 76115 |
| Base 16 | 67916 | 68216 |