25156865720 has 32 divisors (see below), whose sum is σ = 64689084000. Its totient is φ = 8625211008.

The previous prime is 25156865663. The next prime is 25156865729. The reversal of 25156865720 is 2756865152.

It is a super-2 number, since 2×25156865720² (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 (25156865729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44922695 + ... + 44923254.

It is an arithmetic number, because the mean of its divisors is an integer number (2021533875).

Almost surely, 2^25156865720 is an apocalyptic number.

25156865720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25156865720 is an abundant number, since it is smaller than the sum of its proper divisors (39532218280).

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

25156865720 is a wasteful number, since it uses less digits than its factorization.

25156865720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89845967 (or 89845963 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 25156865720 in words is "twenty-five billion, one hundred fifty-six million, eight hundred sixty-five thousand, seven hundred twenty".