64653509 has 2 divisors, whose sum is σ = 64653510. Its totient is φ = 64653508.

The previous prime is 64653497. The next prime is 64653517. The reversal of 64653509 is 90535646.

64653509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52157284 + 12496225 = 7222^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 64653509 - 2²⁴ = 47876293 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64653559) 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, 32326754 + 32326755.

It is an arithmetic number, because the mean of its divisors is an integer number (32326755).

Almost surely, 2^64653509 is an apocalyptic number.

It is an amenable number.

64653509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64653509 is an equidigital number, since it uses as much as digits as its factorization.

64653509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 64653509 is about 8040.7405753450. The cubic root of 64653509 is about 401.3568691442.

The spelling of 64653509 in words is "sixty-four million, six hundred fifty-three thousand, five hundred nine".