Compare 661 vs 665
Property | 661 | 665 |
---|---|---|
Type | prime | composite number |
Unique factors | 1 | 3 |
Total factors | 1 | 3 |
Prime factorization | 6611 | 51 × 71 × 191 |
Prime factorization | 661 | 5 × 7 × 19 |
Divisors count | 2 | 8 |
Divisors | 1, 661 | 1, 5, 7, 19, 35, 95, 133, 665 |
Number of properties | 5 | 0 |
Additive primes | 65th | |
Centered decagonal primes | 8th | |
Primes | 121st | |
Pythagorean primes | 57th | |
Twin primes (2nd member) | 30th | |
Roman numberals | DCLXI | DCLXV |
Base 2 | 10100101012 | 10100110012 |
Base 3 | 2201113 | 2201223 |
Base 4 | 221114 | 221214 |
Base 5 | 101215 | 101305 |
Base 6 | 30216 | 30256 |
Base 7 | 16337 | 16407 |
Base 8 | 12258 | 12318 |
Base 9 | 8149 | 8189 |
Base 10 | 66110 | 66510 |
Base 11 | 55111 | 55511 |
Base 12 | 47112 | 47512 |
Base 13 | 3bb13 | 3c213 |
Base 14 | 35314 | 35714 |
Base 15 | 2e115 | 2e515 |
Base 16 | 29516 | 29916 |