25640679415 has 16 divisors (see below), whose sum is σ = 33156478656. Its totient is φ = 18922752000.

The previous prime is 25640679391. The next prime is 25640679443. The reversal of 25640679415 is 51497604652.

It is a de Polignac number, because none of the positive numbers 2^k-25640679415 is a prime.

It is a Duffinian 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, 19131 + ... + 227260.

It is an arithmetic number, because the mean of its divisors is an integer number (2072279916).

Almost surely, 2^25640679415 is an apocalyptic number.

25640679415 is a deficient number, since it is larger than the sum of its proper divisors (7515799241).

25640679415 is a wasteful number, since it uses less digits than its factorization.

25640679415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248010.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 25640679415 in words is "twenty-five billion, six hundred forty million, six hundred seventy-nine thousand, four hundred fifteen".