25731171856 has 40 divisors (see below), whose sum is σ = 53746185024. Its totient is φ = 11863294080.

The previous prime is 25731171853. The next prime is 25731171887. The reversal of 25731171856 is 65817113752.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25731171853) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 131661 + ... + 262291.

Almost surely, 2^25731171856 is an apocalyptic number.

25731171856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25731171856 is an abundant number, since it is smaller than the sum of its proper divisors (28015013168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25731171856 is a wasteful number, since it uses less digits than its factorization.

25731171856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131599 (or 131593 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The spelling of 25731171856 in words is "twenty-five billion, seven hundred thirty-one million, one hundred seventy-one thousand, eight hundred fifty-six".