9965775289 has 2 divisors, whose sum is σ = 9965775290. Its totient is φ = 9965775288.

The previous prime is 9965775269. The next prime is 9965775307. The reversal of 9965775289 is 9825775699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8262810000 + 1702965289 = 90900^2 + 41267^2 .

It is an emirp because it is prime and its reverse (9825775699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9965775289 - 2¹⁹ = 9965251001 is a prime.

It is a super-2 number, since 2×9965775289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9965775269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982887644 + 4982887645.

It is an arithmetic number, because the mean of its divisors is an integer number (4982887645).

Almost surely, 2^9965775289 is an apocalyptic number.

It is an amenable number.

9965775289 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965775289 is an equidigital number, since it uses as much as digits as its factorization.

9965775289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85730400, while the sum is 67.

The square root of 9965775289 is about 99828.7297775545. The cubic root of 9965775289 is about 2151.9740505830.

The spelling of 9965775289 in words is "nine billion, nine hundred sixty-five million, seven hundred seventy-five thousand, two hundred eighty-nine".