9965782709 has 2 divisors, whose sum is σ = 9965782710. Its totient is φ = 9965782708.

The previous prime is 9965782667. The next prime is 9965782733. The reversal of 9965782709 is 9072875699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5263937809 + 4701844900 = 72553^2 + 68570^2 .

It is a cyclic number.

It is not a de Polignac number, because 9965782709 - 2²⁰ = 9964734133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9965782759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982891354 + 4982891355.

It is an arithmetic number, because the mean of its divisors is an integer number (4982891355).

Almost surely, 2^9965782709 is an apocalyptic number.

It is an amenable number.

9965782709 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965782709 is an equidigital number, since it uses as much as digits as its factorization.

9965782709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The square root of 9965782709 is about 99828.7669411979. The cubic root of 9965782709 is about 2151.9745846656.

The spelling of 9965782709 in words is "nine billion, nine hundred sixty-five million, seven hundred eighty-two thousand, seven hundred nine".