8345656409 has 2 divisors, whose sum is σ = 8345656410. Its totient is φ = 8345656408.

The previous prime is 8345656393. The next prime is 8345656411. The reversal of 8345656409 is 9046565438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8217966409 + 127690000 = 90653^2 + 11300^2 .

It is a cyclic number.

It is not a de Polignac number, because 8345656409 - 2⁴ = 8345656393 is a prime.

Together with 8345656411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8345656489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172828204 + 4172828205.

It is an arithmetic number, because the mean of its divisors is an integer number (4172828205).

Almost surely, 2^8345656409 is an apocalyptic number.

It is an amenable number.

8345656409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8345656409 is an equidigital number, since it uses as much as digits as its factorization.

8345656409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The square root of 8345656409 is about 91354.5642483177. The cubic root of 8345656409 is about 2028.3995254637.

The spelling of 8345656409 in words is "eight billion, three hundred forty-five million, six hundred fifty-six thousand, four hundred nine".