65945609 has 2 divisors, whose sum is σ = 65945610. Its totient is φ = 65945608.

The previous prime is 65945603. The next prime is 65945611. The reversal of 65945609 is 90654956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 3139984 = 7925^2 + 1772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65945609 is a prime.

Together with 65945611, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65945609.

It is not a weakly prime, because it can be changed into another prime (65945603) 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, 32972804 + 32972805.

It is an arithmetic number, because the mean of its divisors is an integer number (32972805).

Almost surely, 2^65945609 is an apocalyptic number.

It is an amenable number.

65945609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65945609 is an equidigital number, since it uses as much as digits as its factorization.

65945609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 65945609 is about 8120.6901800278. The cubic root of 65945609 is about 404.0129578728.

The spelling of 65945609 in words is "sixty-five million, nine hundred forty-five thousand, six hundred nine".