256623183465 has 32 divisors (see below), whose sum is σ = 448060502016. Its totient is φ = 124385472960.

The previous prime is 256623183407. The next prime is 256623183533. The reversal of 256623183465 is 564381326652.

It is not a de Polignac number, because 256623183465 - 2⁹ = 256623182953 is a prime.

It is a super-2 number, since 2×256623183465² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310504 + ... + 780806.

It is an arithmetic number, because the mean of its divisors is an integer number (14001890688).

Almost surely, 2^256623183465 is an apocalyptic number.

It is an amenable number.

256623183465 is a deficient number, since it is larger than the sum of its proper divisors (191437318551).

256623183465 is a wasteful number, since it uses less digits than its factorization.

256623183465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473629.

The product of its digits is 6220800, while the sum is 51.

The spelling of 256623183465 in words is "two hundred fifty-six billion, six hundred twenty-three million, one hundred eighty-three thousand, four hundred sixty-five".