66216593 has 2 divisors, whose sum is σ = 66216594. Its totient is φ = 66216592.

The previous prime is 66216587. The next prime is 66216607. The reversal of 66216593 is 39561266.

66216593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57047809 + 9168784 = 7553^2 + 3028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66216593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66216583) 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, 33108296 + 33108297.

It is an arithmetic number, because the mean of its divisors is an integer number (33108297).

Almost surely, 2^66216593 is an apocalyptic number.

It is an amenable number.

66216593 is a deficient number, since it is larger than the sum of its proper divisors (1).

66216593 is an equidigital number, since it uses as much as digits as its factorization.

66216593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 66216593 is about 8137.3578635820. The cubic root of 66216593 is about 404.5655922353.

The spelling of 66216593 in words is "sixty-six million, two hundred sixteen thousand, five hundred ninety-three".