25979731533 has 16 divisors (see below), whose sum is σ = 43986847360. Its totient is φ = 14845560768.

The previous prime is 25979731511. The next prime is 25979731543. The reversal of 25979731533 is 33513797952.

25979731533 is a `hidden beast` number, since 2 + 5 + 9 + 79 + 7 + 31 + 533 = 666.

It is not a de Polignac number, because 25979731533 - 2⁵ = 25979731501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25979731533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25979731543) 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, 68729260 + ... + 68729637.

It is an arithmetic number, because the mean of its divisors is an integer number (2749177960).

Almost surely, 2^25979731533 is an apocalyptic number.

It is an amenable number.

25979731533 is a deficient number, since it is larger than the sum of its proper divisors (18007115827).

25979731533 is a wasteful number, since it uses less digits than its factorization.

25979731533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137458913 (or 137458907 counting only the distinct ones).

The product of its digits is 5358150, while the sum is 54.

The spelling of 25979731533 in words is "twenty-five billion, nine hundred seventy-nine million, seven hundred thirty-one thousand, five hundred thirty-three".