18167988089 has 2 divisors, whose sum is σ = 18167988090. Its totient is φ = 18167988088.

The previous prime is 18167988079. The next prime is 18167988103. The reversal of 18167988089 is 98088976181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14083755625 + 4084232464 = 118675^2 + 63908^2 .

It is a cyclic number.

It is not a de Polignac number, because 18167988089 - 2⁴ = 18167988073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18167988049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083994044 + 9083994045.

It is an arithmetic number, because the mean of its divisors is an integer number (9083994045).

Almost surely, 2^18167988089 is an apocalyptic number.

It is an amenable number.

18167988089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18167988089 is an equidigital number, since it uses as much as digits as its factorization.

18167988089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13934592, while the sum is 65.

The spelling of 18167988089 in words is "eighteen billion, one hundred sixty-seven million, nine hundred eighty-eight thousand, eighty-nine".