25508257580 has 96 divisors (see below), whose sum is σ = 61132506624. Its totient is φ = 8856981504.

The previous prime is 25508257553. The next prime is 25508257613. The reversal of 25508257580 is 8575280552.

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, 9470714 + ... + 9473406.

It is an arithmetic number, because the mean of its divisors is an integer number (636796944).

Almost surely, 2^25508257580 is an apocalyptic number.

25508257580 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 25508257580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30566253312).

25508257580 is an abundant number, since it is smaller than the sum of its proper divisors (35624249044).

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

25508257580 is a wasteful number, since it uses less digits than its factorization.

25508257580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4875 (or 4873 counting only the distinct ones).

The product of its (nonzero) digits is 1120000, while the sum is 47.

The spelling of 25508257580 in words is "twenty-five billion, five hundred eight million, two hundred fifty-seven thousand, five hundred eighty".