166304213 has 2 divisors, whose sum is σ = 166304214. Its totient is φ = 166304212.

The previous prime is 166304209. The next prime is 166304227. The reversal of 166304213 is 312403661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116488849 + 49815364 = 10793^2 + 7058^2 .

It is a cyclic number.

It is not a de Polignac number, because 166304213 - 2² = 166304209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166304713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83152106 + 83152107.

It is an arithmetic number, because the mean of its divisors is an integer number (83152107).

Almost surely, 2^166304213 is an apocalyptic number.

It is an amenable number.

166304213 is a deficient number, since it is larger than the sum of its proper divisors (1).

166304213 is an equidigital number, since it uses as much as digits as its factorization.

166304213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 166304213 is about 12895.8990768383. The cubic root of 166304213 is about 549.9219867311.

Adding to 166304213 its reverse (312403661), we get a palindrome (478707874).

The spelling of 166304213 in words is "one hundred sixty-six million, three hundred four thousand, two hundred thirteen".