18639054163 has 2 divisors, whose sum is σ = 18639054164. Its totient is φ = 18639054162.

The previous prime is 18639054149. The next prime is 18639054193. The reversal of 18639054163 is 36145093681.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18639054163 is a prime.

It is not a weakly prime, because it can be changed into another prime (18639054113) 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, 9319527081 + 9319527082.

It is an arithmetic number, because the mean of its divisors is an integer number (9319527082).

Almost surely, 2^18639054163 is an apocalyptic number.

18639054163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18639054163 is an equidigital number, since it uses as much as digits as its factorization.

18639054163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 18639054163 in words is "eighteen billion, six hundred thirty-nine million, fifty-four thousand, one hundred sixty-three".