65984609 has 2 divisors, whose sum is σ = 65984610. Its totient is φ = 65984608.

The previous prime is 65984561. The next prime is 65984617. The reversal of 65984609 is 90648956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 12285025 = 7328^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 65984609 - 2⁸ = 65984353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (65984669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32992304 + 32992305.

It is an arithmetic number, because the mean of its divisors is an integer number (32992305).

Almost surely, 2^65984609 is an apocalyptic number.

It is an amenable number.

65984609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65984609 is an equidigital number, since it uses as much as digits as its factorization.

65984609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 65984609 is about 8123.0910988367. The cubic root of 65984609 is about 404.0925861225.

The spelling of 65984609 in words is "sixty-five million, nine hundred eighty-four thousand, six hundred nine".