9865208099 has 2 divisors, whose sum is σ = 9865208100. Its totient is φ = 9865208098.

The previous prime is 9865208083. The next prime is 9865208141. The reversal of 9865208099 is 9908025689.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9865208099 - 2⁴ = 9865208083 is a prime.

It is not a weakly prime, because it can be changed into another prime (9865258099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932604049 + 4932604050.

It is an arithmetic number, because the mean of its divisors is an integer number (4932604050).

Almost surely, 2^9865208099 is an apocalyptic number.

9865208099 is a deficient number, since it is larger than the sum of its proper divisors (1).

9865208099 is an equidigital number, since it uses as much as digits as its factorization.

9865208099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The square root of 9865208099 is about 99323.7539514088. The cubic root of 9865208099 is about 2144.7108568949.

The spelling of 9865208099 in words is "nine billion, eight hundred sixty-five million, two hundred eight thousand, ninety-nine".