9965775689 has 2 divisors, whose sum is σ = 9965775690. Its totient is φ = 9965775688.

The previous prime is 9965775667. The next prime is 9965775791. The reversal of 9965775689 is 9865775699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8375361289 + 1590414400 = 91517^2 + 39880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9965775689 is a prime.

It is not a weakly prime, because it can be changed into another prime (9965775289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982887844 + 4982887845.

It is an arithmetic number, because the mean of its divisors is an integer number (4982887845).

Almost surely, 2^9965775689 is an apocalyptic number.

It is an amenable number.

9965775689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965775689 is an equidigital number, since it uses as much as digits as its factorization.

9965775689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 257191200, while the sum is 71.

The square root of 9965775689 is about 99828.7317809858. The cubic root of 9965775689 is about 2151.9740793745.

The spelling of 9965775689 in words is "nine billion, nine hundred sixty-five million, seven hundred seventy-five thousand, six hundred eighty-nine".