216665333 has 2 divisors, whose sum is σ = 216665334. Its totient is φ = 216665332.

The previous prime is 216665329. The next prime is 216665353. The reversal of 216665333 is 333566612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201157489 + 15507844 = 14183^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 216665333 - 2² = 216665329 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216665293 and 216665302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216665353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108332666 + 108332667.

It is an arithmetic number, because the mean of its divisors is an integer number (108332667).

Almost surely, 2^216665333 is an apocalyptic number.

It is an amenable number.

216665333 is a deficient number, since it is larger than the sum of its proper divisors (1).

216665333 is an equidigital number, since it uses as much as digits as its factorization.

216665333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 35.

The square root of 216665333 is about 14719.5561414059. The cubic root of 216665333 is about 600.6154176268.

The spelling of 216665333 in words is "two hundred sixteen million, six hundred sixty-five thousand, three hundred thirty-three".