18668173824 has 240 divisors, whose sum is σ = 57428699328. Its totient is φ = 5817532416.

The previous prime is 18668173819. The next prime is 18668173879. The reversal of 18668173824 is 42837186681.

18668173824 is a `hidden beast` number, since 186 + 6 + 81 + 7 + 382 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13081399 + ... + 13082825.

Almost surely, 2^18668173824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18668173824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28714349664).

18668173824 is an abundant number, since it is smaller than the sum of its proper divisors (38760525504).

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

18668173824 is a wasteful number, since it uses less digits than its factorization.

18668173824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1616 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 18668173824 in words is "eighteen billion, six hundred sixty-eight million, one hundred seventy-three thousand, eight hundred twenty-four".