Compare 660658 vs 660661
| Property | 660658 | 660661 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 3303291 | 6606611 |
| Prime factorization | 2 × 330329 | 660661 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 330329, 660658 | 1, 660661 |
| Number of properties | 1 | 3 |
| Centered decagonal primes | 153rd | |
| Primes | 53621st | |
| Semiprimes | 141374th | |
| Twin primes (2nd member) | 5785th | |
| Roman numberals | ||
| Base 2 | 101000010100101100102 | 101000010100101101012 |
| Base 3 | 10201200202113 | 10201200202213 |
| Base 4 | 22011023024 | 22011023114 |
| Base 5 | 1321201135 | 1321201215 |
| Base 6 | 220543346 | 220543416 |
| Base 7 | 54210557 | 54210617 |
| Base 8 | 24122628 | 24122658 |
| Base 9 | 12162249 | 12162279 |
| Base 10 | 66065810 | 66066110 |
| Base 11 | 4113a911 | 41140111 |
| Base 12 | 27a3aa12 | 27a3b112 |
| Base 13 | 1a192b13 | 1a193113 |
| Base 14 | 132a9c14 | 132aa114 |
| Base 15 | d0b3d15 | d0b4115 |
| Base 16 | a14b216 | a14b516 |