18556438484664 has 80 divisors (see below), whose sum is σ = 52601417142120. Its totient is φ = 6110955627840.

The previous prime is 18556438484657. The next prime is 18556438484693. The reversal of 18556438484664 is 46648483465581.

18556438484664 is a `hidden beast` number, since 1 + 8 + 5 + 56 + 4 + 38 + 484 + 6 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 18556438484592 and 18556438484601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 172455127 + ... + 172562694.

Almost surely, 2^{18556438484664} is an apocalyptic number.

It is an amenable number.

18556438484664 is an abundant number, since it is smaller than the sum of its proper divisors (34044978657456).

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

18556438484664 is a wasteful number, since it uses less digits than its factorization.

18556438484664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345017922 (or 345017909 counting only the distinct ones).

The product of its digits is 2123366400, while the sum is 72.

The spelling of 18556438484664 in words is "eighteen trillion, five hundred fifty-six billion, four hundred thirty-eight million, four hundred eighty-four thousand, six hundred sixty-four".