6660217 has 2 divisors, whose sum is σ = 6660218. Its totient is φ = 6660216.

The previous prime is 6660211. The next prime is 6660221. The reversal of 6660217 is 7120666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6610041 + 50176 = 2571^2 + 224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660217 is a prime.

It is a Chen prime.

6660217 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6660211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330108 + 3330109.

It is an arithmetic number, because the mean of its divisors is an integer number (3330109).

Almost surely, 2^6660217 is an apocalyptic number.

It is an amenable number.

6660217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660217 is an equidigital number, since it uses as much as digits as its factorization.

6660217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 6660217 is about 2580.7396226663. The cubic root of 6660217 is about 188.1464925059.

The spelling of 6660217 in words is "six million, six hundred sixty thousand, two hundred seventeen".