18973666720 has 48 divisors (see below), whose sum is σ = 44860078368. Its totient is φ = 7583576320.

The previous prime is 18973666717. The next prime is 18973666721. The reversal of 18973666720 is 2766637981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18973666721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163755 + ... + 254485.

It is an arithmetic number, because the mean of its divisors is an integer number (934584966).

Almost surely, 2^18973666720 is an apocalyptic number.

18973666720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18973666720 is an abundant number, since it is smaller than the sum of its proper divisors (25886411648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18973666720 is a wasteful number, since it uses less digits than its factorization.

18973666720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92053 (or 92045 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 18973666720 in words is "eighteen billion, nine hundred seventy-three million, six hundred sixty-six thousand, seven hundred twenty".