25255221576 has 128 divisors (see below), whose sum is σ = 71049726720. Its totient is φ = 7422649344.

The previous prime is 25255221559. The next prime is 25255221601. The reversal of 25255221576 is 67512255252.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6291346 + ... + 6295358.

It is an arithmetic number, because the mean of its divisors is an integer number (555075990).

Almost surely, 2^25255221576 is an apocalyptic number.

25255221576 is a gapful number since it is divisible by the number (26) 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 25255221576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35524863360).

25255221576 is an abundant number, since it is smaller than the sum of its proper divisors (45794505144).

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

25255221576 is a wasteful number, since it uses less digits than its factorization.

25255221576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4935 (or 4931 counting only the distinct ones).

The product of its digits is 420000, while the sum is 42.

The spelling of 25255221576 in words is "twenty-five billion, two hundred fifty-five million, two hundred twenty-one thousand, five hundred seventy-six".