25721857116 has 72 divisors (see below), whose sum is σ = 66144798720. Its totient is φ = 8426781216.

The previous prime is 25721857043. The next prime is 25721857141. The reversal of 25721857116 is 61175812752.

25721857116 is a `hidden beast` number, since 2 + 5 + 72 + 1 + 8 + 571 + 1 + 6 = 666.

It is a super-2 number, since 2×25721857116² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462915 + ... + 515493.

It is an arithmetic number, because the mean of its divisors is an integer number (918677760).

Almost surely, 2^25721857116 is an apocalyptic number.

It is an amenable number.

25721857116 is an abundant number, since it is smaller than the sum of its proper divisors (40422941604).

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

25721857116 is a wasteful number, since it uses less digits than its factorization.

25721857116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52823 (or 52818 counting only the distinct ones).

The product of its digits is 235200, while the sum is 45.

The spelling of 25721857116 in words is "twenty-five billion, seven hundred twenty-one million, eight hundred fifty-seven thousand, one hundred sixteen".