64565009 has 2 divisors, whose sum is σ = 64565010. Its totient is φ = 64565008.

The previous prime is 64565003. The next prime is 64565029. The reversal of 64565009 is 90056546.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 1203409 = 7960^2 + 1097^2 .

It is a cyclic number.

It is not a de Polignac number, because 64565009 - 2⁴ = 64564993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64565009.

It is not a weakly prime, because it can be changed into another prime (64565003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32282504 + 32282505.

It is an arithmetic number, because the mean of its divisors is an integer number (32282505).

Almost surely, 2^64565009 is an apocalyptic number.

It is an amenable number.

64565009 is a deficient number, since it is larger than the sum of its proper divisors (1).

64565009 is an equidigital number, since it uses as much as digits as its factorization.

64565009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 64565009 is about 8035.2354663694. The cubic root of 64565009 is about 401.1736550498.

The spelling of 64565009 in words is "sixty-four million, five hundred sixty-five thousand, nine".