256623444464 has 10 divisors (see below), whose sum is σ = 497207923680. Its totient is φ = 128311722224.

The previous prime is 256623444431. The next prime is 256623444547. The reversal of 256623444464 is 464444326652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8019482624 + ... + 8019482655.

It is an arithmetic number, because the mean of its divisors is an integer number (49720792368).

Almost surely, 2^256623444464 is an apocalyptic number.

It is an amenable number.

256623444464 is a deficient number, since it is larger than the sum of its proper divisors (240584479216).

256623444464 is a wasteful number, since it uses less digits than its factorization.

256623444464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16038965287 (or 16038965281 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 50.

The spelling of 256623444464 in words is "two hundred fifty-six billion, six hundred twenty-three million, four hundred forty-four thousand, four hundred sixty-four".