18381591359 has 4 divisors (see below), whose sum is σ = 18382664040. Its totient is φ = 18380518680.

The previous prime is 18381591353. The next prime is 18381591373. The reversal of 18381591359 is 95319518381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18381591359 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 18381591359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381591353) 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, 510212 + ... + 545049.

It is an arithmetic number, because the mean of its divisors is an integer number (4595666010).

Almost surely, 2^18381591359 is an apocalyptic number.

18381591359 is a deficient number, since it is larger than the sum of its proper divisors (1072681).

18381591359 is a wasteful number, since it uses less digits than its factorization.

18381591359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072680.

The product of its digits is 1166400, while the sum is 53.

The spelling of 18381591359 in words is "eighteen billion, three hundred eighty-one million, five hundred ninety-one thousand, three hundred fifty-nine".