18039122173 has 2 divisors, whose sum is σ = 18039122174. Its totient is φ = 18039122172.

The previous prime is 18039122141. The next prime is 18039122207. The reversal of 18039122173 is 37122193081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15860379844 + 2178742329 = 125938^2 + 46677^2 .

It is a cyclic number.

It is not a de Polignac number, because 18039122173 - 2⁵ = 18039122141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18039122113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019561086 + 9019561087.

It is an arithmetic number, because the mean of its divisors is an integer number (9019561087).

Almost surely, 2^18039122173 is an apocalyptic number.

It is an amenable number.

18039122173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039122173 is an equidigital number, since it uses as much as digits as its factorization.

18039122173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 18039122173 in words is "eighteen billion, thirty-nine million, one hundred twenty-two thousand, one hundred seventy-three".