25879312917 has 16 divisors (see below), whose sum is σ = 38632397760. Its totient is φ = 17121171600.

The previous prime is 25879312909. The next prime is 25879312931. The reversal of 25879312917 is 71921397852.

It is a happy number.

25879312917 is a `hidden beast` number, since 2 + 587 + 9 + 31 + 29 + 1 + 7 = 666.

It is not a de Polignac number, because 25879312917 - 2³ = 25879312909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25879312717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3654834 + ... + 3661907.

It is an arithmetic number, because the mean of its divisors is an integer number (2414524860).

Almost surely, 2^25879312917 is an apocalyptic number.

25879312917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25879312917 is a deficient number, since it is larger than the sum of its proper divisors (12753084843).

25879312917 is a wasteful number, since it uses less digits than its factorization.

25879312917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7316881 (or 7316875 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 25879312917 in words is "twenty-five billion, eight hundred seventy-nine million, three hundred twelve thousand, nine hundred seventeen".