18505384704 has 216 divisors, whose sum is σ = 56885337600. Its totient is φ = 5768755200.

The previous prime is 18505384693. The next prime is 18505384739. The reversal of 18505384704 is 40748350581.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18505384704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3455629 + ... + 3460979.

Almost surely, 2^18505384704 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 18505384704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28442668800).

18505384704 is an abundant number, since it is smaller than the sum of its proper divisors (38379952896).

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

18505384704 is a wasteful number, since it uses less digits than its factorization.

18505384704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471 (or 5454 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 18505384704 in words is "eighteen billion, five hundred five million, three hundred eighty-four thousand, seven hundred four".