18169081121 has 16 divisors (see below), whose sum is σ = 19043942400. Its totient is φ = 17312912400.

The previous prime is 18169081087. The next prime is 18169081123. The reversal of 18169081121 is 12118096181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18169081121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18169081123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1841720 + ... + 1851558.

It is an arithmetic number, because the mean of its divisors is an integer number (1190246400).

Almost surely, 2^18169081121 is an apocalyptic number.

It is an amenable number.

18169081121 is a deficient number, since it is larger than the sum of its proper divisors (874861279).

18169081121 is an equidigital number, since it uses as much as digits as its factorization.

18169081121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10780.

The product of its (nonzero) digits is 6912, while the sum is 38.

The spelling of 18169081121 in words is "eighteen billion, one hundred sixty-nine million, eighty-one thousand, one hundred twenty-one".