64568513 has 2 divisors, whose sum is σ = 64568514. Its totient is φ = 64568512.

The previous prime is 64568507. The next prime is 64568531. The reversal of 64568513 is 31586546.

Together with next prime (64568531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 25230529 = 6272^2 + 5023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64568513 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 (64568113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32284256 + 32284257.

It is an arithmetic number, because the mean of its divisors is an integer number (32284257).

Almost surely, 2^64568513 is an apocalyptic number.

It is an amenable number.

64568513 is a deficient number, since it is larger than the sum of its proper divisors (1).

64568513 is an equidigital number, since it uses as much as digits as its factorization.

64568513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 64568513 is about 8035.4535030700. The cubic root of 64568513 is about 401.1809122679.

The spelling of 64568513 in words is "sixty-four million, five hundred sixty-eight thousand, five hundred thirteen".