25123521720 has 64 divisors (see below), whose sum is σ = 82222439040. Its totient is φ = 6090550400.

The previous prime is 25123521719. The next prime is 25123521727. The reversal of 25123521720 is 2712532152.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25123521727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9515166 + ... + 9517805.

It is an arithmetic number, because the mean of its divisors is an integer number (1284725610).

Almost surely, 2^25123521720 is an apocalyptic number.

25123521720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25123521720 is an abundant number, since it is smaller than the sum of its proper divisors (57098917320).

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

25123521720 is a wasteful number, since it uses less digits than its factorization.

25123521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19032996 (or 19032992 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 25123521720 in words is "twenty-five billion, one hundred twenty-three million, five hundred twenty-one thousand, seven hundred twenty".