25135232520 has 32 divisors (see below), whose sum is σ = 75405697920. Its totient is φ = 6702728640.

The previous prime is 25135232503. The next prime is 25135232567. The reversal of 25135232520 is 2523253152.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104730016 + ... + 104730255.

It is an arithmetic number, because the mean of its divisors is an integer number (2356428060).

Almost surely, 2^25135232520 is an apocalyptic number.

25135232520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25135232520 is an abundant number, since it is smaller than the sum of its proper divisors (50270465400).

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

25135232520 is a wasteful number, since it uses less digits than its factorization.

25135232520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209460285 (or 209460281 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 25135232520 its reverse (2523253152), we get a palindrome (27658485672).

The spelling of 25135232520 in words is "twenty-five billion, one hundred thirty-five million, two hundred thirty-two thousand, five hundred twenty".