12966557 has 2 divisors, whose sum is σ = 12966558.
Its totient is φ = 12966556.
The previous prime is 12966497. The next prime is 12966559. The reversal of 12966557 is 75566921.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 11978521 + 988036 = 3461^2 + 994^2
It is a cyclic number.
It is not a de Polignac number, because 12966557 - 218 = 12704413 is a prime.
Together with 12966559, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12966559) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6483278 + 6483279.
It is an arithmetic number, because the mean of its divisors is an integer number (6483279).
Almost surely, 212966557 is an apocalyptic number.
It is an amenable number.
12966557 is a deficient number, since it is larger than the sum of its proper divisors (1).
12966557 is an equidigital number, since it uses as much as digits as its factorization.
12966557 is an evil number, because the sum of its binary digits is even.
The product of its digits is 113400, while the sum is 41.
The square root of 12966557 is about 3600.9105792841.
The cubic root of 12966557 is about 234.9316656603.
The spelling of 12966557 in words is "twelve million, nine hundred sixty-six thousand, five hundred fifty-seven".