66700717 has 2 divisors, whose sum is σ = 66700718. Its totient is φ = 66700716.

The previous prime is 66700693. The next prime is 66700721. The reversal of 66700717 is 71700766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66683556 + 17161 = 8166^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 66700717 - 2¹¹ = 66698669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66700217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350358 + 33350359.

It is an arithmetic number, because the mean of its divisors is an integer number (33350359).

Almost surely, 2^66700717 is an apocalyptic number.

It is an amenable number.

66700717 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700717 is an equidigital number, since it uses as much as digits as its factorization.

66700717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 66700717 is about 8167.0506916512. The cubic root of 66700717 is about 405.5491549569.

The spelling of 66700717 in words is "sixty-six million, seven hundred thousand, seven hundred seventeen".