18199820179 has 2 divisors, whose sum is σ = 18199820180. Its totient is φ = 18199820178.

The previous prime is 18199820161. The next prime is 18199820189. The reversal of 18199820179 is 97102899181.

It is a strong prime.

It is an emirp because it is prime and its reverse (97102899181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18199820179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18199820159) 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, 9099910089 + 9099910090.

It is an arithmetic number, because the mean of its divisors is an integer number (9099910090).

Almost surely, 2^18199820179 is an apocalyptic number.

18199820179 is a deficient number, since it is larger than the sum of its proper divisors (1).

18199820179 is an equidigital number, since it uses as much as digits as its factorization.

18199820179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 55.

The spelling of 18199820179 in words is "eighteen billion, one hundred ninety-nine million, eight hundred twenty thousand, one hundred seventy-nine".