25115661020 has 48 divisors (see below), whose sum is σ = 53990465760. Its totient is φ = 9808813056.

The previous prime is 25115661019. The next prime is 25115661061. The reversal of 25115661020 is 2016651152.

It is a happy number.

It is a congruent number.

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, 3375224 + ... + 3382656.

It is an arithmetic number, because the mean of its divisors is an integer number (1124801370).

Almost surely, 2^25115661020 is an apocalyptic number.

25115661020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25115661020 is an abundant number, since it is smaller than the sum of its proper divisors (28874804740).

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

25115661020 is a wasteful number, since it uses less digits than its factorization.

25115661020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414 (or 11412 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 25115661020 in words is "twenty-five billion, one hundred fifteen million, six hundred sixty-one thousand, twenty".