Compare 666139 vs 666142
| Property | 666139 | 666142 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6661391 | 21 × 3330711 |
| Prime factorization | 666139 | 2 × 333071 |
| Divisors count | 2 | 4 |
| Divisors | 1, 666139 | 1, 2, 333071, 666142 |
| Number of properties | 4 | 1 |
| Additive primes | 21093rd | |
| Cousin primes (1st member) | 5825th | |
| Isolated primes | 42372nd | |
| Primes | 54035th | |
| Semiprimes | 142485th | |
| Roman numberals | ||
| Base 2 | 101000101010000110112 | 101000101010000111102 |
| Base 3 | 10202112022113 | 10202112022213 |
| Base 4 | 22022201234 | 22022201324 |
| Base 5 | 1323040245 | 1323040325 |
| Base 6 | 221355516 | 221355546 |
| Base 7 | 54430457 | 54430517 |
| Base 8 | 24250338 | 24250368 |
| Base 9 | 12246849 | 12246879 |
| Base 10 | 66613910 | 66614210 |
| Base 11 | 41553111 | 41553411 |
| Base 12 | 2815b712 | 2815ba12 |
| Base 13 | 1a428613 | 1a428913 |
| Base 14 | 134a9514 | 134a9814 |
| Base 15 | d259415 | d259715 |
| Base 16 | a2a1b16 | a2a1e16 |