18867118019 has 2 divisors, whose sum is σ = 18867118020. Its totient is φ = 18867118018.

The previous prime is 18867118003. The next prime is 18867118073. The reversal of 18867118019 is 91081176881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91081176881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18867118019 - 2⁴ = 18867118003 is a prime.

It is a super-2 number, since 2×18867118019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18867118219) 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, 9433559009 + 9433559010.

It is an arithmetic number, because the mean of its divisors is an integer number (9433559010).

Almost surely, 2^18867118019 is an apocalyptic number.

18867118019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18867118019 is an equidigital number, since it uses as much as digits as its factorization.

18867118019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 50.

The spelling of 18867118019 in words is "eighteen billion, eight hundred sixty-seven million, one hundred eighteen thousand, nineteen".