25520852520 has 64 divisors (see below), whose sum is σ = 85069512000. Its totient is φ = 6805560384.

The previous prime is 25520852503. The next prime is 25520852521. The reversal of 25520852520 is 2525802552.

25520852520 is a `hidden beast` number, since 2 + 5 + 52 + 0 + 85 + 2 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25520852521) 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, 11814130 + ... + 11816289.

It is an arithmetic number, because the mean of its divisors is an integer number (1329211125).

Almost surely, 2^25520852520 is an apocalyptic number.

25520852520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25520852520 is an abundant number, since it is smaller than the sum of its proper divisors (59548659480).

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

25520852520 is a wasteful number, since it uses less digits than its factorization.

25520852520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23630439 (or 23630429 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 25520852520 in words is "twenty-five billion, five hundred twenty million, eight hundred fifty-two thousand, five hundred twenty".