18118200091 has 4 divisors (see below), whose sum is σ = 18147757312. Its totient is φ = 18088642872.

The previous prime is 18118200073. The next prime is 18118200119. The reversal of 18118200091 is 19000281181.

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

It is a cyclic number.

It is not a de Polignac number, because 18118200091 - 2⁵ = 18118200059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18118200011) 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, 14777691 + ... + 14778916.

It is an arithmetic number, because the mean of its divisors is an integer number (4536939328).

Almost surely, 2^18118200091 is an apocalyptic number.

18118200091 is a deficient number, since it is larger than the sum of its proper divisors (29557221).

18118200091 is an equidigital number, since it uses as much as digits as its factorization.

18118200091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29557220.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 18118200091 in words is "eighteen billion, one hundred eighteen million, two hundred thousand, ninety-one".