18368705189 has 4 divisors (see below), whose sum is σ = 18372537600. Its totient is φ = 18364872780.

The previous prime is 18368705171. The next prime is 18368705203. The reversal of 18368705189 is 98150786381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18368705189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368705489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1909007 + ... + 1918604.

It is an arithmetic number, because the mean of its divisors is an integer number (4593134400).

Almost surely, 2^18368705189 is an apocalyptic number.

It is an amenable number.

18368705189 is a deficient number, since it is larger than the sum of its proper divisors (3832411).

18368705189 is an equidigital number, since it uses as much as digits as its factorization.

18368705189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832410.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 18368705189 in words is "eighteen billion, three hundred sixty-eight million, seven hundred five thousand, one hundred eighty-nine".