660691718925 has 24 divisors (see below), whose sum is σ = 1248392734656. Its totient is φ = 302030499840.

The previous prime is 660691718899. The next prime is 660691718941. The reversal of 660691718925 is 529817196066.

It is not a de Polignac number, because 660691718925 - 2¹³ = 660691710733 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 629229684 + ... + 629230733.

It is an arithmetic number, because the mean of its divisors is an integer number (52016363944).

Almost surely, 2^660691718925 is an apocalyptic number.

It is an amenable number.

660691718925 is a deficient number, since it is larger than the sum of its proper divisors (587701015731).

660691718925 is a wasteful number, since it uses less digits than its factorization.

660691718925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258460437 (or 1258460432 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 660691718925 in words is "six hundred sixty billion, six hundred ninety-one million, seven hundred eighteen thousand, nine hundred twenty-five".