256640888046652 has 24 divisors (see below), whose sum is σ = 450341797780224. Its totient is φ = 127972226851392.

The previous prime is 256640888046629. The next prime is 256640888046679.

256640888046652 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×256640888046652² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50562943 + ... + 55406614.

It is an arithmetic number, because the mean of its divisors is an integer number (18764241574176).

Almost surely, 2^{256640888046652} is an apocalyptic number.

It is an amenable number.

256640888046652 is a deficient number, since it is larger than the sum of its proper divisors (193700909733572).

256640888046652 is a wasteful number, since it uses less digits than its factorization.

256640888046652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105971205 (or 105971203 counting only the distinct ones).

The product of its (nonzero) digits is 1061683200, while the sum is 70.

The spelling of 256640888046652 in words is "two hundred fifty-six trillion, six hundred forty billion, eight hundred eighty-eight million, forty-six thousand, six hundred fifty-two".