18947794943 has 16 divisors (see below), whose sum is σ = 23681022720. Its totient is φ = 14728392000.

The previous prime is 18947794939. The next prime is 18947794961. The reversal of 18947794943 is 34949774981.

It is not a de Polignac number, because 18947794943 - 2² = 18947794939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18947794943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947794993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269333 + ... + 332318.

It is an arithmetic number, because the mean of its divisors is an integer number (1480063920).

Almost surely, 2^18947794943 is an apocalyptic number.

18947794943 is a deficient number, since it is larger than the sum of its proper divisors (4733227777).

18947794943 is a wasteful number, since it uses less digits than its factorization.

18947794943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602078.

The product of its digits is 54867456, while the sum is 65.

The spelling of 18947794943 in words is "eighteen billion, nine hundred forty-seven million, seven hundred ninety-four thousand, nine hundred forty-three".