12640700725 has 12 divisors (see below), whose sum is σ = 15908418304. Its totient is φ = 9961625520.

The previous prime is 12640700707. The next prime is 12640700731. The reversal of 12640700725 is 52700704621.

It is not a de Polignac number, because 12640700725 - 2²⁷ = 12506482997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3771669 + ... + 3775018.

Almost surely, 2^12640700725 is an apocalyptic number.

It is an amenable number.

12640700725 is a deficient number, since it is larger than the sum of its proper divisors (3267717579).

12640700725 is an equidigital number, since it uses as much as digits as its factorization.

12640700725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7546764 (or 7546759 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 12640700725 in words is "twelve billion, six hundred forty million, seven hundred thousand, seven hundred twenty-five".