25525013520 has 80 divisors (see below), whose sum is σ = 81856100160. Its totient is φ = 6571955712.

The previous prime is 25525013509. The next prime is 25525013551. The reversal of 25525013520 is 2531052552.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 1826734 + ... + 1840653.

It is an arithmetic number, because the mean of its divisors is an integer number (1023201252).

Almost surely, 2^25525013520 is an apocalyptic number.

25525013520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25525013520 is an abundant number, since it is smaller than the sum of its proper divisors (56331086640).

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

25525013520 is a wasteful number, since it uses less digits than its factorization.

25525013520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667432 (or 3667426 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 25525013520 in words is "twenty-five billion, five hundred twenty-five million, thirteen thousand, five hundred twenty".