Compare 1666 vs 1667
| Property | 1666 | 1667 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 21 × 72 × 171 | 16671 |
| Prime factorization | 2 × 7 × 7 × 17 | 1667 |
| Divisors count | 12 | 2 |
| Divisors | 1, 2, 7, 14, 17, 34, 49, 98, 119, 238, 833, 1666 | 1, 1667 |
| Number of properties | 0 | 6 |
| Chen primes | 165th | |
| Cousin primes (2nd member) | 59th | |
| Harmonic primes | 92nd | |
| Primes | 262nd | |
| Prime triplets (2nd member) | 43rd | |
| Twin primes (1st member) | 53rd | |
| Roman numberals | MDCLXVI | MDCLXVII |
| Base 2 | 110100000102 | 110100000112 |
| Base 3 | 20212013 | 20212023 |
| Base 4 | 1220024 | 1220034 |
| Base 5 | 231315 | 231325 |
| Base 6 | 114146 | 114156 |
| Base 7 | 46007 | 46017 |
| Base 8 | 32028 | 32038 |
| Base 9 | 22519 | 22529 |
| Base 10 | 166610 | 166710 |
| Base 11 | 128511 | 128611 |
| Base 12 | b6a12 | b6b12 |
| Base 13 | 9b213 | 9b313 |
| Base 14 | 87014 | 87114 |
| Base 15 | 76115 | 76215 |
| Base 16 | 68216 | 68316 |