Compare 661 vs 4651
| Property | 661 | 4651 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 6611 | 46511 |
| Prime factorization | 661 | 4651 |
| Divisors count | 2 | 2 |
| Divisors | 1, 661 | 1, 4651 |
| Number of properties | 5 | 6 |
| Additive primes | 65th | |
| Centered decagonal primes | 8th | 20th |
| Long primes | 248th | |
| Primes | 121st | 629th |
| Pythagorean primes | 57th | |
| Sexy primes (1st member) | 229th | |
| Sexy prime triplets (1st member) | 78th | |
| Twin primes (2nd member) | 30th | 121st |
| Roman numberals | DCLXI | MMMMDCLI |
| Base 2 | 10100101012 | 10010001010112 |
| Base 3 | 2201113 | 201010213 |
| Base 4 | 221114 | 10202234 |
| Base 5 | 101215 | 1221015 |
| Base 6 | 30216 | 333116 |
| Base 7 | 16337 | 163637 |
| Base 8 | 12258 | 110538 |
| Base 9 | 8149 | 63379 |
| Base 10 | 66110 | 465110 |
| Base 11 | 55111 | 354911 |
| Base 12 | 47112 | 283712 |
| Base 13 | 3bb13 | 216a13 |
| Base 14 | 35314 | 19a314 |
| Base 15 | 2e115 | 15a115 |
| Base 16 | 29516 | 122b16 |