18947794944 has 192 divisors, whose sum is σ = 54783630720. Its totient is φ = 5789122560.

The previous prime is 18947794939. The next prime is 18947794961. The reversal of 18947794944 is 44949774981.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12539149 + ... + 12540659.

It is an arithmetic number, because the mean of its divisors is an integer number (285331410).

Almost surely, 2^18947794944 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 18947794944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27391815360).

18947794944 is an abundant number, since it is smaller than the sum of its proper divisors (35835835776).

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

18947794944 is a wasteful number, since it uses less digits than its factorization.

18947794944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1686 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 66.

The spelling of 18947794944 in words is "eighteen billion, nine hundred forty-seven million, seven hundred ninety-four thousand, nine hundred forty-four".