Compare 661961 vs 661966
| Property | 661961 | 661966 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 6619611 | 21 × 3309831 |
| Prime factorization | 661961 | 2 × 330983 |
| Divisors count | 2 | 4 |
| Divisors | 1, 661961 | 1, 2, 330983, 661966 |
| Number of properties | 4 | 1 |
| Additive primes | 20969th | |
| Isolated primes | 42126th | |
| Primes | 53715th | |
| Semiprimes | 141645th | |
| Sophie germain primes | 5462nd | |
| Roman numberals | ||
| Base 2 | 101000011001110010012 | 101000011001110011102 |
| Base 3 | 10201220010023 | 10201220010213 |
| Base 4 | 22012130214 | 22012130324 |
| Base 5 | 1321403215 | 1321403315 |
| Base 6 | 221043456 | 221043546 |
| Base 7 | 54246267 | 54246347 |
| Base 8 | 24147118 | 24147168 |
| Base 9 | 12180329 | 12180379 |
| Base 10 | 66196110 | 66196610 |
| Base 11 | 41238311 | 41238811 |
| Base 12 | 27b0b512 | 27b0ba12 |
| Base 13 | 1a23c113 | 1a23c613 |
| Base 14 | 13334d14 | 13335414 |
| Base 15 | d120b15 | d121115 |
| Base 16 | a19c916 | a19ce16 |