18238261589 has 16 divisors (see below), whose sum is σ = 20079622656. Its totient is φ = 16490380800.

The previous prime is 18238261571. The next prime is 18238261597. The reversal of 18238261589 is 98516283281.

It is not a de Polignac number, because 18238261589 - 2⁸ = 18238261333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18238261589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238260589) 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, 54107 + ... + 198504.

It is an arithmetic number, because the mean of its divisors is an integer number (1254976416).

Almost surely, 2^18238261589 is an apocalyptic number.

It is an amenable number.

18238261589 is a deficient number, since it is larger than the sum of its proper divisors (1841361067).

18238261589 is a wasteful number, since it uses less digits than its factorization.

18238261589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252796.

The product of its digits is 1658880, while the sum is 53.

The spelling of 18238261589 in words is "eighteen billion, two hundred thirty-eight million, two hundred sixty-one thousand, five hundred eighty-nine".