18731585666 has 8 divisors (see below), whose sum is σ = 28223376384. Its totient is φ = 9323793540.

The previous prime is 18731585657. The next prime is 18731585683. The reversal of 18731585666 is 66658513781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20999090 + ... + 20999981.

It is an arithmetic number, because the mean of its divisors is an integer number (3527922048).

Almost surely, 2^18731585666 is an apocalyptic number.

18731585666 is a deficient number, since it is larger than the sum of its proper divisors (9491790718).

18731585666 is a wasteful number, since it uses less digits than its factorization.

18731585666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41999296.

The product of its digits is 7257600, while the sum is 56.

The spelling of 18731585666 in words is "eighteen billion, seven hundred thirty-one million, five hundred eighty-five thousand, six hundred sixty-six".