18217387315 has 16 divisors (see below), whose sum is σ = 21957850080. Its totient is φ = 14509393920.

The previous prime is 18217387277. The next prime is 18217387319. The reversal of 18217387315 is 51378371281.

It is not a de Polignac number, because 18217387315 - 2²⁵ = 18183832883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18217387319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085085 + ... + 1101745.

It is an arithmetic number, because the mean of its divisors is an integer number (1372365630).

Almost surely, 2^18217387315 is an apocalyptic number.

18217387315 is a deficient number, since it is larger than the sum of its proper divisors (3740462765).

18217387315 is a wasteful number, since it uses less digits than its factorization.

18217387315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17622.

The product of its digits is 282240, while the sum is 46.

The spelling of 18217387315 in words is "eighteen billion, two hundred seventeen million, three hundred eighty-seven thousand, three hundred fifteen".