18317537387 has 16 divisors (see below), whose sum is σ = 19272072960. Its totient is φ = 17376688032.

The previous prime is 18317537333. The next prime is 18317537411. The reversal of 18317537387 is 78373571381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18317537387 - 2⁸ = 18317537131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18317531387) 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, 1661708 + ... + 1672694.

It is an arithmetic number, because the mean of its divisors is an integer number (1204504560).

Almost surely, 2^18317537387 is an apocalyptic number.

18317537387 is a deficient number, since it is larger than the sum of its proper divisors (954535573).

18317537387 is a wasteful number, since it uses less digits than its factorization.

18317537387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11602.

The product of its digits is 2963520, while the sum is 53.

The spelling of 18317537387 in words is "eighteen billion, three hundred seventeen million, five hundred thirty-seven thousand, three hundred eighty-seven".