8505465509 has 2 divisors, whose sum is σ = 8505465510. Its totient is φ = 8505465508.

The previous prime is 8505465491. The next prime is 8505465557. The reversal of 8505465509 is 9055645058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8505450625 + 14884 = 92225^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 8505465509 - 2⁸ = 8505465253 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 (8505465569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252732754 + 4252732755.

It is an arithmetic number, because the mean of its divisors is an integer number (4252732755).

Almost surely, 2^8505465509 is an apocalyptic number.

It is an amenable number.

8505465509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505465509 is an equidigital number, since it uses as much as digits as its factorization.

8505465509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The square root of 8505465509 is about 92225.0806939197. The cubic root of 8505465509 is about 2041.2648753308.

The spelling of 8505465509 in words is "eight billion, five hundred five million, four hundred sixty-five thousand, five hundred nine".