25897718231 has 16 divisors (see below), whose sum is σ = 33038953728. Its totient is φ = 19710734400.

The previous prime is 25897718221. The next prime is 25897718233. The reversal of 25897718231 is 13281779852.

It is a de Polignac number, because none of the positive numbers 2^k-25897718231 is a prime.

It is a super-2 number, since 2×25897718231² (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 (25897718233) 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, 3907550 + ... + 3914171.

It is an arithmetic number, because the mean of its divisors is an integer number (2064934608).

Almost surely, 2^25897718231 is an apocalyptic number.

25897718231 is a deficient number, since it is larger than the sum of its proper divisors (7141235497).

25897718231 is a wasteful number, since it uses less digits than its factorization.

25897718231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821782.

The product of its digits is 1693440, while the sum is 53.

The spelling of 25897718231 in words is "twenty-five billion, eight hundred ninety-seven million, seven hundred eighteen thousand, two hundred thirty-one".