65330809 has 2 divisors, whose sum is σ = 65330810. Its totient is φ = 65330808.

The previous prime is 65330801. The next prime is 65330831. The reversal of 65330809 is 90803356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42863209 + 22467600 = 6547^2 + 4740^2 .

It is a cyclic number.

It is not a de Polignac number, because 65330809 - 2³ = 65330801 is a prime.

It is a super-2 number, since 2×65330809² = 8536229209188962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65330801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32665404 + 32665405.

It is an arithmetic number, because the mean of its divisors is an integer number (32665405).

Almost surely, 2^65330809 is an apocalyptic number.

It is an amenable number.

65330809 is a deficient number, since it is larger than the sum of its proper divisors (1).

65330809 is an equidigital number, since it uses as much as digits as its factorization.

65330809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 65330809 is about 8082.7476145182. The cubic root of 65330809 is about 402.7535205678.

The spelling of 65330809 in words is "sixty-five million, three hundred thirty thousand, eight hundred nine".