25554155220 has 72 divisors (see below), whose sum is σ = 84561029280. Its totient is φ = 6194946240.

The previous prime is 25554155161. The next prime is 25554155261. The reversal of 25554155220 is 2255145552.

25554155220 is a `hidden beast` number, since 2 + 55 + 54 + 1 + 552 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6451090 + ... + 6455049.

It is an arithmetic number, because the mean of its divisors is an integer number (1174458740).

Almost surely, 2^25554155220 is an apocalyptic number.

25554155220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25554155220 is an abundant number, since it is smaller than the sum of its proper divisors (59006874060).

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

25554155220 is a wasteful number, since it uses less digits than its factorization.

25554155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12906165 (or 12906160 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 25554155220 in words is "twenty-five billion, five hundred fifty-four million, one hundred fifty-five thousand, two hundred twenty".