Compare 557 vs 661
| Property | 557 | 661 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 5571 | 6611 |
| Prime factorization | 557 | 661 |
| Divisors count | 2 | 2 |
| Divisors | 1, 557 | 1, 661 |
| Number of properties | 9 | 5 |
| Additive primes | 55th | 65th |
| Centered decagonal primes | 8th | |
| Chen primes | 72nd | |
| Good primes | 29th | |
| Harmonic primes | 43rd | |
| Isolated primes | 53rd | |
| Primes | 102nd | 121st |
| Pythagorean primes | 48th | 57th |
| Sexy primes (1st member) | 49th | |
| Sexy prime triplets (1st member) | 20th | |
| Twin primes (2nd member) | 30th | |
| Roman numberals | DLVII | DCLXI |
| Base 2 | 10001011012 | 10100101012 |
| Base 3 | 2021223 | 2201113 |
| Base 4 | 202314 | 221114 |
| Base 5 | 42125 | 101215 |
| Base 6 | 23256 | 30216 |
| Base 7 | 14247 | 16337 |
| Base 8 | 10558 | 12258 |
| Base 9 | 6789 | 8149 |
| Base 10 | 55710 | 66110 |
| Base 11 | 46711 | 55111 |
| Base 12 | 3a512 | 47112 |
| Base 13 | 33b13 | 3bb13 |
| Base 14 | 2bb14 | 35314 |
| Base 15 | 27215 | 2e115 |
| Base 16 | 22d16 | 29516 |