256615564 has 6 divisors (see below), whose sum is σ = 449077244. Its totient is φ = 128307780.

The previous prime is 256615547. The next prime is 256615589. The reversal of 256615564 is 465516652.

256615564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32076942 + ... + 32076949.

Almost surely, 2^256615564 is an apocalyptic number.

It is an amenable number.

256615564 is a deficient number, since it is larger than the sum of its proper divisors (192461680).

256615564 is a wasteful number, since it uses less digits than its factorization.

256615564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64153895 (or 64153893 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 256615564 is about 16019.2248251905. The cubic root of 256615564 is about 635.4689441139.

The spelling of 256615564 in words is "two hundred fifty-six million, six hundred fifteen thousand, five hundred sixty-four".