18204344173 has 2 divisors, whose sum is σ = 18204344174. Its totient is φ = 18204344172.

The previous prime is 18204344161. The next prime is 18204344251. The reversal of 18204344173 is 37144340281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12682813924 + 5521530249 = 112618^2 + 74307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18204344173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18204344153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9102172086 + 9102172087.

It is an arithmetic number, because the mean of its divisors is an integer number (9102172087).

Almost surely, 2^18204344173 is an apocalyptic number.

It is an amenable number.

18204344173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18204344173 is an equidigital number, since it uses as much as digits as its factorization.

18204344173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 18204344173 in words is "eighteen billion, two hundred four million, three hundred forty-four thousand, one hundred seventy-three".