25866520920 has 96 divisors (see below), whose sum is σ = 86338296720. Its totient is φ = 6711310080.

The previous prime is 25866520877. The next prime is 25866520961. The reversal of 25866520920 is 2902566852.

25866520920 is a `hidden beast` number, since 2 + 586 + 65 + 2 + 0 + 9 + 2 + 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, 957646 + ... + 984285.

Almost surely, 2^25866520920 is an apocalyptic number.

25866520920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25866520920 is an abundant number, since it is smaller than the sum of its proper divisors (60471775800).

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

25866520920 is a wasteful number, since it uses less digits than its factorization.

25866520920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941985 (or 1941978 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 25866520920 in words is "twenty-five billion, eight hundred sixty-six million, five hundred twenty thousand, nine hundred twenty".