25531940736 has 48 divisors (see below), whose sum is σ = 73470822360. Its totient is φ = 8510646528.

The previous prime is 25531940723. The next prime is 25531940813. The reversal of 25531940736 is 63704913552.

25531940736 is a `hidden beast` number, since 2 + 5 + 531 + 9 + 40 + 73 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 25531940691 and 25531940700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11080420 + ... + 11082723.

Almost surely, 2^25531940736 is an apocalyptic number.

It is an amenable number.

25531940736 is an abundant number, since it is smaller than the sum of its proper divisors (47938881624).

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

25531940736 is a wasteful number, since it uses less digits than its factorization.

25531940736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22163163 (or 22163148 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The spelling of 25531940736 in words is "twenty-five billion, five hundred thirty-one million, nine hundred forty thousand, seven hundred thirty-six".