25621885620 has 72 divisors (see below), whose sum is σ = 77762280960. Its totient is φ = 6828761280.

The previous prime is 25621885579. The next prime is 25621885651. The reversal of 25621885620 is 2658812652.

It is a happy number.

25621885620 is a `hidden beast` number, since 2 + 5 + 6 + 2 + 1 + 88 + 562 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298741 + ... + 374819.

It is an arithmetic number, because the mean of its divisors is an integer number (1080031680).

Almost surely, 2^25621885620 is an apocalyptic number.

25621885620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25621885620 is an abundant number, since it is smaller than the sum of its proper divisors (52140395340).

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

25621885620 is a wasteful number, since it uses less digits than its factorization.

25621885620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77965 (or 77960 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 25621885620 in words is "twenty-five billion, six hundred twenty-one million, eight hundred eighty-five thousand, six hundred twenty".