25116920631 has 24 divisors (see below), whose sum is σ = 39589889664. Its totient is φ = 15217871760.

The previous prime is 25116920627. The next prime is 25116920651. The reversal of 25116920631 is 13602961152.

25116920631 is a `hidden beast` number, since 2 + 5 + 1 + 16 + 9 + 2 + 0 + 631 = 666.

It is not a de Polignac number, because 25116920631 - 2² = 25116920627 is a prime.

It is a super-2 number, since 2×25116920631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25116920651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 315390 + ... + 386916.

It is an arithmetic number, because the mean of its divisors is an integer number (1649578736).

Almost surely, 2^25116920631 is an apocalyptic number.

25116920631 is a deficient number, since it is larger than the sum of its proper divisors (14472969033).

25116920631 is a wasteful number, since it uses less digits than its factorization.

25116920631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75091 (or 75088 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 25116920631 in words is "twenty-five billion, one hundred sixteen million, nine hundred twenty thousand, six hundred thirty-one".