198813761789 has 2 divisors, whose sum is σ = 198813761790. Its totient is φ = 198813761788.

The previous prime is 198813761749. The next prime is 198813761837. The reversal of 198813761789 is 987167318891.

198813761789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121568676889 + 77245084900 = 348667^2 + 277930^2 .

It is a cyclic number.

It is not a de Polignac number, because 198813761789 - 2²⁸ = 198545326333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198813761719) 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, 99406880894 + 99406880895.

It is an arithmetic number, because the mean of its divisors is an integer number (99406880895).

Almost surely, 2^198813761789 is an apocalyptic number.

It is an amenable number.

198813761789 is a deficient number, since it is larger than the sum of its proper divisors (1).

198813761789 is an equidigital number, since it uses as much as digits as its factorization.

198813761789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 68.

The spelling of 198813761789 in words is "one hundred ninety-eight billion, eight hundred thirteen million, seven hundred sixty-one thousand, seven hundred eighty-nine".