25666666536 has 64 divisors (see below), whose sum is σ = 74893639680. Its totient is φ = 7177302720.

The previous prime is 25666666471. The next prime is 25666666549. The reversal of 25666666536 is 63566666652.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1617400 + ... + 1633191.

It is an arithmetic number, because the mean of its divisors is an integer number (1170213120).

Almost surely, 2^25666666536 is an apocalyptic number.

It is an amenable number.

25666666536 is an abundant number, since it is smaller than the sum of its proper divisors (49226973144).

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

25666666536 is a wasteful number, since it uses less digits than its factorization.

25666666536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250654 (or 3250650 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 57.

The spelling of 25666666536 in words is "twenty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred thirty-six".