199959806089 has 2 divisors, whose sum is σ = 199959806090. Its totient is φ = 199959806088.

The previous prime is 199959806077. The next prime is 199959806093. The reversal of 199959806089 is 980608959991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199956537225 + 3268864 = 447165^2 + 1808^2 .

It is a cyclic number.

It is not a de Polignac number, because 199959806089 - 2¹⁹ = 199959281801 is a prime.

It is not a weakly prime, because it can be changed into another prime (199959806069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99979903044 + 99979903045.

It is an arithmetic number, because the mean of its divisors is an integer number (99979903045).

Almost surely, 2^199959806089 is an apocalyptic number.

It is an amenable number.

199959806089 is a deficient number, since it is larger than the sum of its proper divisors (1).

199959806089 is an equidigital number, since it uses as much as digits as its factorization.

199959806089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113374080, while the sum is 73.

The spelling of 199959806089 in words is "one hundred ninety-nine billion, nine hundred fifty-nine million, eight hundred six thousand, eighty-nine".