Compare 661 vs 667
Property | 661 | 667 |
---|---|---|
Type | prime | semiprime |
Unique factors | 1 | 2 |
Total factors | 1 | 2 |
Prime factorization | 6611 | 231 × 291 |
Prime factorization | 661 | 23 × 29 |
Divisors count | 2 | 4 |
Divisors | 1, 661 | 1, 23, 29, 667 |
Number of properties | 5 | 1 |
Additive primes | 65th | |
Centered decagonal primes | 8th | |
Primes | 121st | |
Pythagorean primes | 57th | |
Semiprimes | 199th | |
Twin primes (2nd member) | 30th | |
Roman numberals | DCLXI | DCLXVII |
Base 2 | 10100101012 | 10100110112 |
Base 3 | 2201113 | 2202013 |
Base 4 | 221114 | 221234 |
Base 5 | 101215 | 101325 |
Base 6 | 30216 | 30316 |
Base 7 | 16337 | 16427 |
Base 8 | 12258 | 12338 |
Base 9 | 8149 | 8219 |
Base 10 | 66110 | 66710 |
Base 11 | 55111 | 55711 |
Base 12 | 47112 | 47712 |
Base 13 | 3bb13 | 3c413 |
Base 14 | 35314 | 35914 |
Base 15 | 2e115 | 2e715 |
Base 16 | 29516 | 29b16 |