18966734784 has 84 divisors (see below), whose sum is σ = 54429864216. Its totient is φ = 6314669568.

The previous prime is 18966734771. The next prime is 18966734821. The reversal of 18966734784 is 48743766981.

18966734784 is a `hidden beast` number, since 1 + 8 + 96 + 6 + 73 + 478 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472027 + ... + 510629.

It is an arithmetic number, because the mean of its divisors is an integer number (647974574).

Almost surely, 2^18966734784 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 18966734784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27214932108).

18966734784 is an abundant number, since it is smaller than the sum of its proper divisors (35463129432).

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

18966734784 is a wasteful number, since it uses less digits than its factorization.

18966734784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39474 (or 39461 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 18966734784 in words is "eighteen billion, nine hundred sixty-six million, seven hundred thirty-four thousand, seven hundred eighty-four".