65165609 has 2 divisors, whose sum is σ = 65165610. Its totient is φ = 65165608.

The previous prime is 65165603. The next prime is 65165623. The reversal of 65165609 is 90656156.

65165609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 24970009 = 6340^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 65165609 - 2⁴ = 65165593 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 (65165603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582804 + 32582805.

It is an arithmetic number, because the mean of its divisors is an integer number (32582805).

Almost surely, 2^65165609 is an apocalyptic number.

It is an amenable number.

65165609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65165609 is an equidigital number, since it uses as much as digits as its factorization.

65165609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 65165609 is about 8072.5218488401. The cubic root of 65165609 is about 402.4137572254.

It can be divided in two parts, 6 and 5165609, that added together give a palindrome (5165615).

The spelling of 65165609 in words is "sixty-five million, one hundred sixty-five thousand, six hundred nine".