Compare 661 vs 773
| Property | 661 | 773 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6611 | 7731 |
| Prime factorization | 661 | 773 |
| Divisors count | 2 | 2 |
| Divisors | 1, 661 | 1, 773 |
| Number of properties | 5 | 8 |
| Additive primes | 65th | 72nd |
| Centered decagonal primes | 8th | |
| Cousin primes (2nd member) | 33rd | |
| Isolated primes | 78th | |
| Left-truncatable primes | 44th | |
| Primes | 121st | 137th |
| Pythagorean primes | 57th | 66th |
| Restricted left-truncatable primes | 3rd | |
| Super primes | 33rd | |
| Twin primes (2nd member) | 30th | |
| Roman numberals | DCLXI | DCCLXXIII |
| Base 2 | 10100101012 | 11000001012 |
| Base 3 | 2201113 | 10011223 |
| Base 4 | 221114 | 300114 |
| Base 5 | 101215 | 110435 |
| Base 6 | 30216 | 33256 |
| Base 7 | 16337 | 21537 |
| Base 8 | 12258 | 14058 |
| Base 9 | 8149 | 10489 |
| Base 10 | 66110 | 77310 |
| Base 11 | 55111 | 64311 |
| Base 12 | 47112 | 54512 |
| Base 13 | 3bb13 | 47613 |
| Base 14 | 35314 | 3d314 |
| Base 15 | 2e115 | 36815 |
| Base 16 | 29516 | 30516 |