18989146663 has 2 divisors, whose sum is σ = 18989146664. Its totient is φ = 18989146662.

The previous prime is 18989146639. The next prime is 18989146699. The reversal of 18989146663 is 36664198981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18989146663 - 2²¹ = 18987049511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18939146663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494573331 + 9494573332.

It is an arithmetic number, because the mean of its divisors is an integer number (9494573332).

Almost surely, 2^18989146663 is an apocalyptic number.

18989146663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18989146663 is an equidigital number, since it uses as much as digits as its factorization.

18989146663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 61.

The spelling of 18989146663 in words is "eighteen billion, nine hundred eighty-nine million, one hundred forty-six thousand, six hundred sixty-three".