256556626 has 4 divisors (see below), whose sum is σ = 384834942. Its totient is φ = 128278312.

The previous prime is 256556617. The next prime is 256556627. The reversal of 256556626 is 626655652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 141015625 + 115541001 = 11875^2 + 10749^2 .

It is not an unprimeable number, because it can be changed into a prime (256556627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64139155 + ... + 64139158.

Almost surely, 2^256556626 is an apocalyptic number.

256556626 is a deficient number, since it is larger than the sum of its proper divisors (128278316).

256556626 is a wasteful number, since it uses less digits than its factorization.

256556626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128278315.

The product of its digits is 648000, while the sum is 43.

The square root of 256556626 is about 16017.3851174279. The cubic root of 256556626 is about 635.4202900939.

The spelling of 256556626 in words is "two hundred fifty-six million, five hundred fifty-six thousand, six hundred twenty-six".