18788453664 has 24 divisors (see below), whose sum is σ = 49319691120. Its totient is φ = 6262817856.

The previous prime is 18788453573. The next prime is 18788453683. The reversal of 18788453664 is 46635488781.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 18788453598 and 18788453607.

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, 97856434 + ... + 97856625.

It is an arithmetic number, because the mean of its divisors is an integer number (2054987130).

Almost surely, 2^18788453664 is an apocalyptic number.

It is an amenable number.

18788453664 is an abundant number, since it is smaller than the sum of its proper divisors (30531237456).

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

18788453664 is a wasteful number, since it uses less digits than its factorization.

18788453664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195713072 (or 195713064 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 60.

The spelling of 18788453664 in words is "eighteen billion, seven hundred eighty-eight million, four hundred fifty-three thousand, six hundred sixty-four".