18836185161 has 4 divisors (see below), whose sum is σ = 25114913552. Its totient is φ = 12557456772.

The previous prime is 18836185157. The next prime is 18836185189. The reversal of 18836185161 is 16158163881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18836185161 - 2² = 18836185157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18836185161.

It is not an unprimeable number, because it can be changed into a prime (18836185111) 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, 3139364191 + ... + 3139364196.

It is an arithmetic number, because the mean of its divisors is an integer number (6278728388).

Almost surely, 2^18836185161 is an apocalyptic number.

It is an amenable number.

18836185161 is a deficient number, since it is larger than the sum of its proper divisors (6278728391).

18836185161 is an equidigital number, since it uses as much as digits as its factorization.

18836185161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278728390.

The product of its digits is 276480, while the sum is 48.

The spelling of 18836185161 in words is "eighteen billion, eight hundred thirty-six million, one hundred eighty-five thousand, one hundred sixty-one".