18932278661 has 8 divisors (see below), whose sum is σ = 20266490400. Its totient is φ = 17631844560.

The previous prime is 18932278639. The next prime is 18932278691. The reversal of 18932278661 is 16687223981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18932278661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18932278621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8443250 + ... + 8445491.

It is an arithmetic number, because the mean of its divisors is an integer number (2533311300).

Almost surely, 2^18932278661 is an apocalyptic number.

It is an amenable number.

18932278661 is a deficient number, since it is larger than the sum of its proper divisors (1334211739).

18932278661 is a wasteful number, since it uses less digits than its factorization.

18932278661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16888819.

The product of its digits is 1741824, while the sum is 53.

The spelling of 18932278661 in words is "eighteen billion, nine hundred thirty-two million, two hundred seventy-eight thousand, six hundred sixty-one".