18661372675 has 24 divisors (see below), whose sum is σ = 25250883840. Its totient is φ = 13568071200.

The previous prime is 18661372657. The next prime is 18661372733. The reversal of 18661372675 is 57627316681.

It is a happy number.

It is not a de Polignac number, because 18661372675 - 2⁷ = 18661372547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1279474 + ... + 1293976.

It is an arithmetic number, because the mean of its divisors is an integer number (1052120160).

Almost surely, 2^18661372675 is an apocalyptic number.

18661372675 is a deficient number, since it is larger than the sum of its proper divisors (6589511165).

18661372675 is a wasteful number, since it uses less digits than its factorization.

18661372675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19203 (or 19198 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 52.

The spelling of 18661372675 in words is "eighteen billion, six hundred sixty-one million, three hundred seventy-two thousand, six hundred seventy-five".