25640891924 has 96 divisors (see below), whose sum is σ = 48829326336. Its totient is φ = 11751505920.

The previous prime is 25640891909. The next prime is 25640891963. The reversal of 25640891924 is 42919804652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47395094 + ... + 47395634.

It is an arithmetic number, because the mean of its divisors is an integer number (508638816).

Almost surely, 2^25640891924 is an apocalyptic number.

It is an amenable number.

25640891924 is a deficient number, since it is larger than the sum of its proper divisors (23188434412).

25640891924 is a wasteful number, since it uses less digits than its factorization.

25640891924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 25640891924 in words is "twenty-five billion, six hundred forty million, eight hundred ninety-one thousand, nine hundred twenty-four".