18517222084 has 27 divisors (see below), whose sum is σ = 34209990381. Its totient is φ = 8768866320.

The previous prime is 18517222081. The next prime is 18517222123. The reversal of 18517222084 is 48022271581.

The square root of 18517222084 is 136078.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16506596484 + 2010625600 = 128478^2 + 44840^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18517222081) 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 8 ways as a sum of consecutive naturals, for example, 5169174 + ... + 5172754.

Almost surely, 2^18517222084 is an apocalyptic number.

18517222084 is the 136078-th square number.

It is an amenable number.

18517222084 is a deficient number, since it is larger than the sum of its proper divisors (15692768297).

18517222084 is an frugal number, since it uses more digits than its factorization.

18517222084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7204 (or 3602 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 18517222084 in words is "eighteen billion, five hundred seventeen million, two hundred twenty-two thousand, eighty-four".