12663840725 has 12 divisors (see below), whose sum is σ = 15847231620. Its totient is φ = 10038124800.

The previous prime is 12663840697. The next prime is 12663840757. The reversal of 12663840725 is 52704836621.

It can be written as a sum of positive squares in 6 ways, for example, as 361038001 + 12302802724 = 19001^2 + 110918^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12663840725 is a prime.

It is a Curzon 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, 2320916 + ... + 2326365.

It is an arithmetic number, because the mean of its divisors is an integer number (1320602635).

Almost surely, 2^12663840725 is an apocalyptic number.

It is an amenable number.

12663840725 is a deficient number, since it is larger than the sum of its proper divisors (3183390895).

12663840725 is a wasteful number, since it uses less digits than its factorization.

12663840725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647400 (or 4647395 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 12663840725 in words is "twelve billion, six hundred sixty-three million, eight hundred forty thousand, seven hundred twenty-five".