18431625589 has 4 divisors (see below), whose sum is σ = 19849442956. Its totient is φ = 17013808224.

The previous prime is 18431625551. The next prime is 18431625593. The reversal of 18431625589 is 98552613481.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9488708100 + 8942917489 = 97410^2 + 94567^2 .

It is a cyclic number.

It is not a de Polignac number, because 18431625589 - 2¹⁵ = 18431592821 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 (18431625389) 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, 708908664 + ... + 708908689.

It is an arithmetic number, because the mean of its divisors is an integer number (4962360739).

Almost surely, 2^18431625589 is an apocalyptic number.

It is an amenable number.

18431625589 is a deficient number, since it is larger than the sum of its proper divisors (1417817367).

18431625589 is a wasteful number, since it uses less digits than its factorization.

18431625589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417817366.

The product of its digits is 2073600, while the sum is 52.

The spelling of 18431625589 in words is "eighteen billion, four hundred thirty-one million, six hundred twenty-five thousand, five hundred eighty-nine".