18325638864 has 240 divisors, whose sum is σ = 57122857792. Its totient is φ = 5448425472.

The previous prime is 18325638853. The next prime is 18325638883. The reversal of 18325638864 is 46883652381.

18325638864 is a `hidden beast` number, since 1 + 8 + 3 + 256 + 388 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18325638864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7806939 + ... + 7809285.

Almost surely, 2^18325638864 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 18325638864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28561428896).

18325638864 is an abundant number, since it is smaller than the sum of its proper divisors (38797218928).

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

18325638864 is a wasteful number, since it uses less digits than its factorization.

18325638864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2514 (or 2505 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The spelling of 18325638864 in words is "eighteen billion, three hundred twenty-five million, six hundred thirty-eight thousand, eight hundred sixty-four".