25565652864 has 96 divisors (see below), whose sum is σ = 76292656440. Its totient is φ = 8521873920.

The previous prime is 25565652859. The next prime is 25565652913. The reversal of 25565652864 is 46825656552.

25565652864 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 56 + 528 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 25565652864.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 379867 + ... + 442074.

Almost surely, 2^25565652864 is an apocalyptic number.

25565652864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25565652864 is an abundant number, since it is smaller than the sum of its proper divisors (50727003576).

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

25565652864 is an frugal number, since it uses more digits than its factorization.

25565652864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821970 (or 821946 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 54.

The spelling of 25565652864 in words is "twenty-five billion, five hundred sixty-five million, six hundred fifty-two thousand, eight hundred sixty-four".