9965928449 has 2 divisors, whose sum is σ = 9965928450. Its totient is φ = 9965928448.

The previous prime is 9965928443. The next prime is 9965928491. The reversal of 9965928449 is 9448295699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5853015025 + 4112913424 = 76505^2 + 64132^2 .

It is a cyclic number.

It is not a de Polignac number, because 9965928449 - 2¹⁶ = 9965862913 is a prime.

It is not a weakly prime, because it can be changed into another prime (9965928443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982964224 + 4982964225.

It is an arithmetic number, because the mean of its divisors is an integer number (4982964225).

It is a Proth number, since it is equal to 38017 ⋅ 2¹⁸ + 1 and 38017 < 2¹⁸.

Almost surely, 2^9965928449 is an apocalyptic number.

It is an amenable number.

9965928449 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965928449 is an equidigital number, since it uses as much as digits as its factorization.

9965928449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50388480, while the sum is 65.

The square root of 9965928449 is about 99829.4968884447. The cubic root of 9965928449 is about 2151.9850748016.

The spelling of 9965928449 in words is "nine billion, nine hundred sixty-five million, nine hundred twenty-eight thousand, four hundred forty-nine".