25504555220 has 24 divisors (see below), whose sum is σ = 53572092000. Its totient is φ = 10199436192.

The previous prime is 25504555207. The next prime is 25504555231. The reversal of 25504555220 is 2255540552.

It is a congruent number.

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, 60170 + ... + 233729.

It is an arithmetic number, because the mean of its divisors is an integer number (2232170500).

Almost surely, 2^25504555220 is an apocalyptic number.

25504555220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25504555220 is an abundant number, since it is smaller than the sum of its proper divisors (28067536780).

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

25504555220 is a wasteful number, since it uses less digits than its factorization.

25504555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298247 (or 298245 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 35.

The spelling of 25504555220 in words is "twenty-five billion, five hundred four million, five hundred fifty-five thousand, two hundred twenty".