8516516609 has 2 divisors, whose sum is σ = 8516516610. Its totient is φ = 8516516608.

The previous prime is 8516516573. The next prime is 8516516627. The reversal of 8516516609 is 9066156158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5186880400 + 3329636209 = 72020^2 + 57703^2 .

It is a cyclic number.

It is not a de Polignac number, because 8516516609 - 2¹² = 8516512513 is a prime.

It is not a weakly prime, because it can be changed into another prime (8516516689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4258258304 + 4258258305.

It is an arithmetic number, because the mean of its divisors is an integer number (4258258305).

Almost surely, 2^8516516609 is an apocalyptic number.

It is an amenable number.

8516516609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8516516609 is an equidigital number, since it uses as much as digits as its factorization.

8516516609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 8516516609 is about 92284.9749905151. The cubic root of 8516516609 is about 2042.1485604297.

The spelling of 8516516609 in words is "eight billion, five hundred sixteen million, five hundred sixteen thousand, six hundred nine".