166335217 has 2 divisors, whose sum is σ = 166335218. Its totient is φ = 166335216.

The previous prime is 166335203. The next prime is 166335251. The reversal of 166335217 is 712533661.

166335217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (166335251) can be obtained adding 166335217 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161823841 + 4511376 = 12721^2 + 2124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166335217 is a prime.

It is not a weakly prime, because it can be changed into another prime (166335277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83167608 + 83167609.

It is an arithmetic number, because the mean of its divisors is an integer number (83167609).

Almost surely, 2^166335217 is an apocalyptic number.

It is an amenable number.

166335217 is a deficient number, since it is larger than the sum of its proper divisors (1).

166335217 is an equidigital number, since it uses as much as digits as its factorization.

166335217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 166335217 is about 12897.1011083887. The cubic root of 166335217 is about 549.9561584889.

Adding to 166335217 its reverse (712533661), we get a palindrome (878868878).

The spelling of 166335217 in words is "one hundred sixty-six million, three hundred thirty-five thousand, two hundred seventeen".