25565631256 has 32 divisors (see below), whose sum is σ = 53179675200. Its totient is φ = 11423777440.

The previous prime is 25565631251. The next prime is 25565631257. The reversal of 25565631256 is 65213656552.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565631251) 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, 2456830 + ... + 2467213.

It is an arithmetic number, because the mean of its divisors is an integer number (1661864850).

Almost surely, 2^25565631256 is an apocalyptic number.

It is an amenable number.

25565631256 is an abundant number, since it is smaller than the sum of its proper divisors (27614043944).

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

25565631256 is a wasteful number, since it uses less digits than its factorization.

25565631256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924119 (or 4924115 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 46.

The spelling of 25565631256 in words is "twenty-five billion, five hundred sixty-five million, six hundred thirty-one thousand, two hundred fifty-six".