25696624656 has 40 divisors (see below), whose sum is σ = 68524336384. Its totient is φ = 8289233280.

The previous prime is 25696624619. The next prime is 25696624699. The reversal of 25696624656 is 65642669652.

It is a super-2 number, since 2×25696624656² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25696624596 and 25696624605.

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, 8633131 + ... + 8636106.

Almost surely, 2^25696624656 is an apocalyptic number.

It is an amenable number.

25696624656 is an abundant number, since it is smaller than the sum of its proper divisors (42827711728).

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

25696624656 is a wasteful number, since it uses less digits than its factorization.

25696624656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17269279 (or 17269273 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 57.

The spelling of 25696624656 in words is "twenty-five billion, six hundred ninety-six million, six hundred twenty-four thousand, six hundred fifty-six".