Compare 1661 vs 1668
| Property | 1661 | 1668 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 4 |
| Prime factorization | 111 × 1511 | 22 × 31 × 1391 |
| Prime factorization | 11 × 151 | 2 × 2 × 3 × 139 |
| Divisors count | 4 | 12 |
| Divisors | 1, 11, 151, 1661 | 1, 2, 3, 4, 6, 12, 139, 278, 417, 556, 834, 1668 |
| Number of properties | 1 | 0 |
| Semiprimes | 479th | |
| Roman numberals | MDCLXI | MDCLXVIII |
| Base 2 | 110011111012 | 110100001002 |
| Base 3 | 20211123 | 20212103 |
| Base 4 | 1213314 | 1220104 |
| Base 5 | 231215 | 231335 |
| Base 6 | 114056 | 114206 |
| Base 7 | 45627 | 46027 |
| Base 8 | 31758 | 32048 |
| Base 9 | 22459 | 22539 |
| Base 10 | 166110 | 166810 |
| Base 11 | 128011 | 128711 |
| Base 12 | b6512 | b7012 |
| Base 13 | 9aa13 | 9b413 |
| Base 14 | 86914 | 87214 |
| Base 15 | 75b15 | 76315 |
| Base 16 | 67d16 | 68416 |