65816609 has 2 divisors, whose sum is σ = 65816610. Its totient is φ = 65816608.

The previous prime is 65816561. The next prime is 65816623. The reversal of 65816609 is 90661856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48344209 + 17472400 = 6953^2 + 4180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65816609 is a prime.

It is a Chen prime.

It is equal to p_3885890 and since 65816609 and 3885890 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (65816669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32908304 + 32908305.

It is an arithmetic number, because the mean of its divisors is an integer number (32908305).

Almost surely, 2^65816609 is an apocalyptic number.

It is an amenable number.

65816609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65816609 is an equidigital number, since it uses as much as digits as its factorization.

65816609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 65816609 is about 8112.7436172974. The cubic root of 65816609 is about 403.7493482466.

The spelling of 65816609 in words is "sixty-five million, eight hundred sixteen thousand, six hundred nine".