18517666163 has 2 divisors, whose sum is σ = 18517666164. Its totient is φ = 18517666162.

The previous prime is 18517666147. The next prime is 18517666199. The reversal of 18517666163 is 36166671581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18517666163 - 2⁴ = 18517666147 is a prime.

It is not a weakly prime, because it can be changed into another prime (18517666463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258833081 + 9258833082.

It is an arithmetic number, because the mean of its divisors is an integer number (9258833082).

Almost surely, 2^18517666163 is an apocalyptic number.

18517666163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18517666163 is an equidigital number, since it uses as much as digits as its factorization.

18517666163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The spelling of 18517666163 in words is "eighteen billion, five hundred seventeen million, six hundred sixty-six thousand, one hundred sixty-three".