25564831020 has 72 divisors (see below), whose sum is σ = 77751470160. Its totient is φ = 6799282560.

The previous prime is 25564831001. The next prime is 25564831031. The reversal of 25564831020 is 2013846552.

25564831020 is a `hidden beast` number, since 2 + 5 + 5 + 648 + 3 + 1 + 0 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 119151 + ... + 255590.

It is an arithmetic number, because the mean of its divisors is an integer number (1079881530).

Almost surely, 2^25564831020 is an apocalyptic number.

25564831020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25564831020 is an abundant number, since it is smaller than the sum of its proper divisors (52186639140).

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

25564831020 is a wasteful number, since it uses less digits than its factorization.

25564831020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375135 (or 375130 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 25564831020 in words is "twenty-five billion, five hundred sixty-four million, eight hundred thirty-one thousand, twenty".