18216998528 has 16 divisors (see below), whose sum is σ = 36291677010. Its totient is φ = 9108499200.

The previous prime is 18216998479. The next prime is 18216998549. The reversal of 18216998528 is 82589961281.

It can be written as a sum of positive squares in only one way, i.e., 17574274624 + 642723904 = 132568^2 + 25352^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71160023 + ... + 71160278.

Almost surely, 2^18216998528 is an apocalyptic number.

It is an amenable number.

18216998528 is a deficient number, since it is larger than the sum of its proper divisors (18074678482).

18216998528 is an equidigital number, since it uses as much as digits as its factorization.

18216998528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142320315 (or 142320303 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 59.

The spelling of 18216998528 in words is "eighteen billion, two hundred sixteen million, nine hundred ninety-eight thousand, five hundred twenty-eight".