25550556100 has 72 divisors (see below), whose sum is σ = 56140234920. Its totient is φ = 10092318720.

The previous prime is 25550556067. The next prime is 25550556151. The reversal of 25550556100 is 165505552.

It can be written as a sum of positive squares in 12 ways, for example, as 5819858944 + 19730697156 = 76288^2 + 140466^2 .

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, 9761992 + ... + 9764608.

It is an arithmetic number, because the mean of its divisors is an integer number (779725485).

Almost surely, 2^25550556100 is an apocalyptic number.

25550556100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25550556100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28070117460).

25550556100 is an abundant number, since it is smaller than the sum of its proper divisors (30589678820).

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

25550556100 is a wasteful number, since it uses less digits than its factorization.

25550556100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817 (or 3810 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 25550556100 in words is "twenty-five billion, five hundred fifty million, five hundred fifty-six thousand, one hundred".