18779995799 has 2 divisors, whose sum is σ = 18779995800. Its totient is φ = 18779995798.

The previous prime is 18779995739. The next prime is 18779995837. The reversal of 18779995799 is 99759997781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18779995799 - 2⁸ = 18779995543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18779995739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9389997899 + 9389997900.

It is an arithmetic number, because the mean of its divisors is an integer number (9389997900).

Almost surely, 2^18779995799 is an apocalyptic number.

18779995799 is a deficient number, since it is larger than the sum of its proper divisors (1).

18779995799 is an equidigital number, since it uses as much as digits as its factorization.

18779995799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810152280, while the sum is 80.

The spelling of 18779995799 in words is "eighteen billion, seven hundred seventy-nine million, nine hundred ninety-five thousand, seven hundred ninety-nine".