25555502220 has 48 divisors (see below), whose sum is σ = 71950770528. Its totient is φ = 6777146880.

The previous prime is 25555502179. The next prime is 25555502233. The reversal of 25555502220 is 2220555552.

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, 1165729 + ... + 1187448.

It is an arithmetic number, because the mean of its divisors is an integer number (1498974386).

Almost surely, 2^25555502220 is an apocalyptic number.

25555502220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25555502220 is an abundant number, since it is smaller than the sum of its proper divisors (46395268308).

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

25555502220 is a wasteful number, since it uses less digits than its factorization.

25555502220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353370 (or 2353368 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 33.

The spelling of 25555502220 in words is "twenty-five billion, five hundred fifty-five million, five hundred two thousand, two hundred twenty".