25634605656 has 128 divisors (see below), whose sum is σ = 73033228800. Its totient is φ = 7422074880.

The previous prime is 25634605631. The next prime is 25634605723. The reversal of 25634605656 is 65650643652.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7387890 + ... + 7391358.

It is an arithmetic number, because the mean of its divisors is an integer number (570572100).

Almost surely, 2^25634605656 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 25634605656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36516614400).

25634605656 is an abundant number, since it is smaller than the sum of its proper divisors (47398623144).

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

25634605656 is a wasteful number, since it uses less digits than its factorization.

25634605656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729 (or 4725 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 25634605656 in words is "twenty-five billion, six hundred thirty-four million, six hundred five thousand, six hundred fifty-six".