25565567840 has 24 divisors (see below), whose sum is σ = 60398654400. Its totient is φ = 10226227072.

The previous prime is 25565567801. The next prime is 25565567851. The reversal of 25565567840 is 4876556552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79892240 + ... + 79892559.

It is an arithmetic number, because the mean of its divisors is an integer number (2516610600).

Almost surely, 2^25565567840 is an apocalyptic number.

25565567840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25565567840 is an abundant number, since it is smaller than the sum of its proper divisors (34833086560).

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

25565567840 is a wasteful number, since it uses less digits than its factorization.

25565567840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159784814 (or 159784806 counting only the distinct ones).

The product of its (nonzero) digits is 10080000, while the sum is 53.

The spelling of 25565567840 in words is "twenty-five billion, five hundred sixty-five million, five hundred sixty-seven thousand, eight hundred forty".