18218732498 has 6 divisors (see below), whose sum is σ = 27328385079. Its totient is φ = 9109270806.

The previous prime is 18218732459. The next prime is 18218732503. The reversal of 18218732498 is 89423781281.

It can be written as a sum of positive squares in only one way, i.e., 9109366249 + 9109366249 = 95443^2 + 95443^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95443.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 143165 + ... + 238607.

Almost surely, 2^18218732498 is an apocalyptic number.

18218732498 is a deficient number, since it is larger than the sum of its proper divisors (9109652581).

18218732498 is an frugal number, since it uses more digits than its factorization.

18218732498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190888 (or 95445 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 53.

The spelling of 18218732498 in words is "eighteen billion, two hundred eighteen million, seven hundred thirty-two thousand, four hundred ninety-eight".