18663716189 has 2 divisors, whose sum is σ = 18663716190. Its totient is φ = 18663716188.

The previous prime is 18663716179. The next prime is 18663716261. The reversal of 18663716189 is 98161736681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16923408100 + 1740308089 = 130090^2 + 41717^2 .

It is a cyclic number.

It is not a de Polignac number, because 18663716189 - 2¹⁶ = 18663650653 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 (18663716179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9331858094 + 9331858095.

It is an arithmetic number, because the mean of its divisors is an integer number (9331858095).

Almost surely, 2^18663716189 is an apocalyptic number.

It is an amenable number.

18663716189 is a deficient number, since it is larger than the sum of its proper divisors (1).

18663716189 is an equidigital number, since it uses as much as digits as its factorization.

18663716189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The spelling of 18663716189 in words is "eighteen billion, six hundred sixty-three million, seven hundred sixteen thousand, one hundred eighty-nine".