25600645656 has 96 divisors (see below), whose sum is σ = 70651666800. Its totient is φ = 8372981760.

The previous prime is 25600645643. The next prime is 25600645709. The reversal of 25600645656 is 65654600652.

It is a happy number.

25600645656 is a `hidden beast` number, since 25 + 6 + 0 + 0 + 64 + 565 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 824200 + ... + 854696.

Almost surely, 2^25600645656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25600645656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35325833400).

25600645656 is an abundant number, since it is smaller than the sum of its proper divisors (45051021144).

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

25600645656 is a wasteful number, since it uses less digits than its factorization.

25600645656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30729 (or 30722 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 25600645656 in words is "twenty-five billion, six hundred million, six hundred forty-five thousand, six hundred fifty-six".