Compare 1661 vs 1685
| Property | 1661 | 1685 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 111 × 1511 | 51 × 3371 |
| Prime factorization | 11 × 151 | 5 × 337 |
| Divisors count | 4 | 4 |
| Divisors | 1, 11, 151, 1661 | 1, 5, 337, 1685 |
| Number of properties | 1 | 1 |
| Semiprimes | 479th | 485th |
| Roman numberals | MDCLXI | MDCLXXXV |
| Base 2 | 110011111012 | 110100101012 |
| Base 3 | 20211123 | 20221023 |
| Base 4 | 1213314 | 1221114 |
| Base 5 | 231215 | 232205 |
| Base 6 | 114056 | 114456 |
| Base 7 | 45627 | 46257 |
| Base 8 | 31758 | 32258 |
| Base 9 | 22459 | 22729 |
| Base 10 | 166110 | 168510 |
| Base 11 | 128011 | 12a211 |
| Base 12 | b6512 | b8512 |
| Base 13 | 9aa13 | 9c813 |
| Base 14 | 86914 | 88514 |
| Base 15 | 75b15 | 77515 |
| Base 16 | 67d16 | 69516 |