65906609 has 2 divisors, whose sum is σ = 65906610. Its totient is φ = 65906608.

The previous prime is 65906591. The next prime is 65906629. The reversal of 65906609 is 90660956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44930209 + 20976400 = 6703^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 65906609 - 2²⁰ = 64858033 is a prime.

It is a super-2 number, since 2×65906609² = 8687362219757762, which contains 22 as substring.

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 (65906629) 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, 32953304 + 32953305.

It is an arithmetic number, because the mean of its divisors is an integer number (32953305).

Almost surely, 2^65906609 is an apocalyptic number.

It is an amenable number.

65906609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65906609 is an equidigital number, since it uses as much as digits as its factorization.

65906609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 65906609 is about 8118.2885511664. The cubic root of 65906609 is about 403.9332982223.

The spelling of 65906609 in words is "sixty-five million, nine hundred six thousand, six hundred nine".