18368722538889 has 8 divisors (see below), whose sum is σ = 24734121438912. Its totient is φ = 12124569332400.

The previous prime is 18368722538879. The next prime is 18368722538893. The reversal of 18368722538889 is 98883522786381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18368722538889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18368722538839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30311423029 + ... + 30311423634.

It is an arithmetic number, because the mean of its divisors is an integer number (3091765179864).

Almost surely, 2^{18368722538889} is an apocalyptic number.

It is an amenable number.

18368722538889 is a deficient number, since it is larger than the sum of its proper divisors (6365398900023).

18368722538889 is a wasteful number, since it uses less digits than its factorization.

18368722538889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60622846767.

The product of its digits is 2229534720, while the sum is 78.

The spelling of 18368722538889 in words is "eighteen trillion, three hundred sixty-eight billion, seven hundred twenty-two million, five hundred thirty-eight thousand, eight hundred eighty-nine".