656424323424656 has 20 divisors (see below), whose sum is σ = 1346635192908492. Its totient is φ = 308905563964416.

The previous prime is 656424323424599. The next prime is 656424323424733.

656424323424656 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 585972071059600 + 70452252365056 = 24206860^2 + 8393584^2 .

It is a super-2 number, since 2×656424323424656² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206662358965 + ... + 1206662359508.

Almost surely, 2^{656424323424656} is an apocalyptic number.

It is an amenable number.

656424323424656 is an abundant number, since it is smaller than the sum of its proper divisors (690210869483836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656424323424656 is a wasteful number, since it uses less digits than its factorization.

656424323424656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413324718498 (or 2413324718492 counting only the distinct ones).

The product of its digits is 597196800, while the sum is 62.

The spelling of 656424323424656 in words is "six hundred fifty-six trillion, four hundred twenty-four billion, three hundred twenty-three million, four hundred twenty-four thousand, six hundred fifty-six".