Compare 157 vs 166
| Property | 157 | 166 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1571 | 21 × 831 |
| Prime factorization | 157 | 2 × 83 |
| Divisors count | 2 | 4 |
| Divisors | 1, 157 | 1, 2, 83, 166 |
| Number of properties | 11 | 1 |
| Additive primes | 21st | |
| Chen primes | 30th | |
| Emirps | 12th | |
| Harmonic primes | 13th | |
| Isolated primes | 14th | |
| Primes | 37th | |
| Pythagorean primes | 17th | |
| Semiprimes | 55th | |
| Sexy primes (1st member) | 22nd | |
| Sexy primes (2nd member) | 21st | |
| Sexy prime triplets (2nd member) | 12th | |
| Super primes | 12th | |
| Roman numberals | CLVII | CLXVI |
| Base 2 | 100111012 | 101001102 |
| Base 3 | 122113 | 200113 |
| Base 4 | 21314 | 22124 |
| Base 5 | 11125 | 11315 |
| Base 6 | 4216 | 4346 |
| Base 7 | 3137 | 3257 |
| Base 8 | 2358 | 2468 |
| Base 9 | 1849 | 2049 |
| Base 10 | 15710 | 16610 |
| Base 11 | 13311 | 14111 |
| Base 12 | 11112 | 11a12 |
| Base 13 | c113 | ca13 |
| Base 14 | b314 | bc14 |
| Base 15 | a715 | b115 |
| Base 16 | 9d16 | a616 |