18168662189 has 2 divisors, whose sum is σ = 18168662190. Its totient is φ = 18168662188.

The previous prime is 18168662177. The next prime is 18168662219. The reversal of 18168662189 is 98126686181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9126554089 + 9042108100 = 95533^2 + 95090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18168662189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18168662129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084331094 + 9084331095.

It is an arithmetic number, because the mean of its divisors is an integer number (9084331095).

Almost surely, 2^18168662189 is an apocalyptic number.

It is an amenable number.

18168662189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168662189 is an equidigital number, since it uses as much as digits as its factorization.

18168662189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 56.

The spelling of 18168662189 in words is "eighteen billion, one hundred sixty-eight million, six hundred sixty-two thousand, one hundred eighty-nine".