166303213 has 2 divisors, whose sum is σ = 166303214. Its totient is φ = 166303212.

The previous prime is 166303211. The next prime is 166303223. The reversal of 166303213 is 312303661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124144164 + 42159049 = 11142^2 + 6493^2 .

It is an emirp because it is prime and its reverse (312303661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166303213 - 2¹ = 166303211 is a prime.

Together with 166303211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166303211) 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, 83151606 + 83151607.

It is an arithmetic number, because the mean of its divisors is an integer number (83151607).

Almost surely, 2^166303213 is an apocalyptic number.

It is an amenable number.

166303213 is a deficient number, since it is larger than the sum of its proper divisors (1).

166303213 is an equidigital number, since it uses as much as digits as its factorization.

166303213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 166303213 is about 12895.8603047645. The cubic root of 166303213 is about 549.9208844878.

Adding to 166303213 its reverse (312303661), we get a palindrome (478606874).

The spelling of 166303213 in words is "one hundred sixty-six million, three hundred three thousand, two hundred thirteen".