256564465652 has 24 divisors (see below), whose sum is σ = 490188555360. Its totient is φ = 116528862560.

The previous prime is 256564465649. The next prime is 256564465657.

256564465652 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256564465657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2226902 + ... + 2339277.

It is an arithmetic number, because the mean of its divisors is an integer number (20424523140).

Almost surely, 2^256564465652 is an apocalyptic number.

256564465652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256564465652 is a deficient number, since it is larger than the sum of its proper divisors (233624089708).

256564465652 is a wasteful number, since it uses less digits than its factorization.

256564465652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4567471 (or 4567469 counting only the distinct ones).

The product of its digits is 51840000, while the sum is 56.

The spelling of 256564465652 in words is "two hundred fifty-six billion, five hundred sixty-four million, four hundred sixty-five thousand, six hundred fifty-two".