25601664216 has 64 divisors (see below), whose sum is σ = 69955246080. Its totient is φ = 7772797440.

The previous prime is 25601664161. The next prime is 25601664239. The reversal of 25601664216 is 61246610652.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 999436 + ... + 1024731.

It is an arithmetic number, because the mean of its divisors is an integer number (1093050720).

Almost surely, 2^25601664216 is an apocalyptic number.

It is an amenable number.

25601664216 is an abundant number, since it is smaller than the sum of its proper divisors (44353581864).

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

25601664216 is a wasteful number, since it uses less digits than its factorization.

25601664216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024224 (or 2024220 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 25601664216 in words is "twenty-five billion, six hundred one million, six hundred sixty-four thousand, two hundred sixteen".