18886169121 has 4 divisors (see below), whose sum is σ = 25181558832. Its totient is φ = 12590779412.

The previous prime is 18886169087. The next prime is 18886169149. The reversal of 18886169121 is 12196168881.

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 a cyclic number.

It is not a de Polignac number, because 18886169121 - 2²⁵ = 18852614689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18886169171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3147694851 + ... + 3147694856.

It is an arithmetic number, because the mean of its divisors is an integer number (6295389708).

Almost surely, 2^18886169121 is an apocalyptic number.

It is an amenable number.

18886169121 is a deficient number, since it is larger than the sum of its proper divisors (6295389711).

18886169121 is an equidigital number, since it uses as much as digits as its factorization.

18886169121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295389710.

The product of its digits is 331776, while the sum is 51.

The spelling of 18886169121 in words is "eighteen billion, eight hundred eighty-six million, one hundred sixty-nine thousand, one hundred twenty-one".