166240213 has 2 divisors, whose sum is σ = 166240214. Its totient is φ = 166240212.

The previous prime is 166240211. The next prime is 166240231. The reversal of 166240213 is 312042661.

Together with next prime (166240231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106131204 + 60109009 = 10302^2 + 7753^2 .

It is a cyclic number.

It is not a de Polignac number, because 166240213 - 2¹ = 166240211 is a prime.

Together with 166240211, 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 (166240211) 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, 83120106 + 83120107.

It is an arithmetic number, because the mean of its divisors is an integer number (83120107).

Almost surely, 2^166240213 is an apocalyptic number.

It is an amenable number.

166240213 is a deficient number, since it is larger than the sum of its proper divisors (1).

166240213 is an equidigital number, since it uses as much as digits as its factorization.

166240213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 166240213 is about 12893.4174290605. The cubic root of 166240213 is about 549.8514342533.

Adding to 166240213 its reverse (312042661), we get a palindrome (478282874).

The spelling of 166240213 in words is "one hundred sixty-six million, two hundred forty thousand, two hundred thirteen".