10391725666 has 24 divisors (see below), whose sum is σ = 18136345500. Its totient is φ = 4452652512.

The previous prime is 10391725639. The next prime is 10391725733. The reversal of 10391725666 is 66652719301.

It can be written as a sum of positive squares in 2 ways, for example, as 10377700641 + 14025025 = 101871^2 + 3745^2 .

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, 651960 + ... + 667708.

Almost surely, 2^10391725666 is an apocalyptic number.

10391725666 is a deficient number, since it is larger than the sum of its proper divisors (7744619834).

10391725666 is a wasteful number, since it uses less digits than its factorization.

10391725666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22498 (or 22491 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 10391725666 in words is "ten billion, three hundred ninety-one million, seven hundred twenty-five thousand, six hundred sixty-six".