66000217 has 2 divisors, whose sum is σ = 66000218. Its totient is φ = 66000216.

The previous prime is 66000203. The next prime is 66000223. The reversal of 66000217 is 71200066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65999376 + 841 = 8124^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000217 - 2¹¹ = 65998169 is a prime.

It is not a weakly prime, because it can be changed into another prime (66000247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000108 + 33000109.

It is an arithmetic number, because the mean of its divisors is an integer number (33000109).

Almost surely, 2^66000217 is an apocalyptic number.

It is an amenable number.

66000217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000217 is an equidigital number, since it uses as much as digits as its factorization.

66000217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 66000217 is about 8124.0517600518. The cubic root of 66000217 is about 404.1244449653.

The spelling of 66000217 in words is "sixty-six million, two hundred seventeen", and thus it is an aban number.