18166915475 has 12 divisors (see below), whose sum is σ = 22661872464. Its totient is φ = 14446501920.

The previous prime is 18166915453. The next prime is 18166915477. The reversal of 18166915475 is 57451966181.

It is a de Polignac number, because none of the positive numbers 2^k-18166915475 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18166915477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2171504 + ... + 2179853.

It is an arithmetic number, because the mean of its divisors is an integer number (1888489372).

Almost surely, 2^18166915475 is an apocalyptic number.

18166915475 is a deficient number, since it is larger than the sum of its proper divisors (4494956989).

18166915475 is a wasteful number, since it uses less digits than its factorization.

18166915475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351534 (or 4351529 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 53.

The spelling of 18166915475 in words is "eighteen billion, one hundred sixty-six million, nine hundred fifteen thousand, four hundred seventy-five".