8245665409 has 2 divisors, whose sum is σ = 8245665410. Its totient is φ = 8245665408.

The previous prime is 8245665403. The next prime is 8245665437. The reversal of 8245665409 is 9045665428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7330784400 + 914881009 = 85620^2 + 30247^2 .

It is a cyclic number.

It is not a de Polignac number, because 8245665409 - 2³ = 8245665401 is a prime.

It is not a weakly prime, because it can be changed into another prime (8245665401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4122832704 + 4122832705.

It is an arithmetic number, because the mean of its divisors is an integer number (4122832705).

Almost surely, 2^8245665409 is an apocalyptic number.

It is an amenable number.

8245665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8245665409 is an equidigital number, since it uses as much as digits as its factorization.

8245665409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The square root of 8245665409 is about 90805.6463497728. The cubic root of 8245665409 is about 2020.2660670509.

The spelling of 8245665409 in words is "eight billion, two hundred forty-five million, six hundred sixty-five thousand, four hundred nine".