18688693990660 has 12 divisors (see below), whose sum is σ = 39246257380428. Its totient is φ = 7475477596256.

The previous prime is 18688693990657. The next prime is 18688693990721. The reversal of 18688693990660 is 6609939688681.

It can be written as a sum of positive squares in 2 ways, for example, as 14728586030656 + 3960107960004 = 3837784^2 + 1990002^2 .

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, 467217349747 + ... + 467217349786.

It is an arithmetic number, because the mean of its divisors is an integer number (3270521448369).

Almost surely, 2^{18688693990660} is an apocalyptic number.

18688693990660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18688693990660 is an abundant number, since it is smaller than the sum of its proper divisors (20557563389768).

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

18688693990660 is a wasteful number, since it uses less digits than its factorization.

18688693990660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934434699542 (or 934434699540 counting only the distinct ones).

The product of its (nonzero) digits is 1451188224, while the sum is 79.

The spelling of 18688693990660 in words is "eighteen trillion, six hundred eighty-eight billion, six hundred ninety-three million, nine hundred ninety thousand, six hundred sixty".