18981492163 has 2 divisors, whose sum is σ = 18981492164. Its totient is φ = 18981492162.

The previous prime is 18981492149. The next prime is 18981492199. The reversal of 18981492163 is 36129418981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18981492163 - 2²⁵ = 18947937731 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18981492163.

It is not a weakly prime, because it can be changed into another prime (18981498163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9490746081 + 9490746082.

It is an arithmetic number, because the mean of its divisors is an integer number (9490746082).

Almost surely, 2^18981492163 is an apocalyptic number.

18981492163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18981492163 is an equidigital number, since it uses as much as digits as its factorization.

18981492163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The spelling of 18981492163 in words is "eighteen billion, nine hundred eighty-one million, four hundred ninety-two thousand, one hundred sixty-three".