18520222173 has 16 divisors (see below), whose sum is σ = 25775715840. Its totient is φ = 11806123824.

The previous prime is 18520222159. The next prime is 18520222177. The reversal of 18520222173 is 37122202581.

It is not a de Polignac number, because 18520222173 - 2⁸ = 18520221917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520222177) 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 in 15 ways as a sum of consecutive naturals, for example, 175818 + ... + 260676.

It is an arithmetic number, because the mean of its divisors is an integer number (1610982240).

Almost surely, 2^18520222173 is an apocalyptic number.

It is an amenable number.

18520222173 is a deficient number, since it is larger than the sum of its proper divisors (7255493667).

18520222173 is a wasteful number, since it uses less digits than its factorization.

18520222173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88048.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 18520222173 in words is "eighteen billion, five hundred twenty million, two hundred twenty-two thousand, one hundred seventy-three".