18484221985 has 32 divisors (see below), whose sum is σ = 23174553600. Its totient is φ = 14135708160.

The previous prime is 18484221983. The next prime is 18484221989. The reversal of 18484221985 is 58912248481.

It is not a de Polignac number, because 18484221985 - 2¹ = 18484221983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18484221983) 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 31 ways as a sum of consecutive naturals, for example, 14013156 + ... + 14014474.

It is an arithmetic number, because the mean of its divisors is an integer number (724204800).

Almost surely, 2^18484221985 is an apocalyptic number.

It is an amenable number.

18484221985 is a deficient number, since it is larger than the sum of its proper divisors (4690331615).

18484221985 is a wasteful number, since it uses less digits than its factorization.

18484221985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241.

The product of its digits is 1474560, while the sum is 52.

The spelling of 18484221985 in words is "eighteen billion, four hundred eighty-four million, two hundred twenty-one thousand, nine hundred eighty-five".