25615538656 has 24 divisors (see below), whose sum is σ = 52623227664. Its totient is φ = 12250909440.

The previous prime is 25615538651. The next prime is 25615538657. The reversal of 25615538656 is 65683551652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25615538651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17401125 + ... + 17402596.

It is an arithmetic number, because the mean of its divisors is an integer number (2192634486).

Almost surely, 2^25615538656 is an apocalyptic number.

It is an amenable number.

25615538656 is an abundant number, since it is smaller than the sum of its proper divisors (27007689008).

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

25615538656 is a wasteful number, since it uses less digits than its factorization.

25615538656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34803754 (or 34803746 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 52.

The spelling of 25615538656 in words is "twenty-five billion, six hundred fifteen million, five hundred thirty-eight thousand, six hundred fifty-six".