166213 has 4 divisors (see below), whose sum is σ = 167040. Its totient is φ = 165388.

The previous prime is 166207. The next prime is 166219. The reversal of 166213 is 312661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 312661 = 83 ⋅3767.

It is an interprime number because it is at equal distance from previous prime (166207) and next prime (166219).

It is a cyclic number.

It is not a de Polignac number, because 166213 - 2⁹ = 165701 is a prime.

It is a super-2 number, since 2×166213² = 55253522738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108 + ... + 586.

It is an arithmetic number, because the mean of its divisors is an integer number (41760).

2¹⁶⁶²¹³ is an apocalyptic number.

It is an amenable number.

166213 is a deficient number, since it is larger than the sum of its proper divisors (827).

166213 is an equidigital number, since it uses as much as digits as its factorization.

166213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 216, while the sum is 19.

The square root of 166213 is about 407.6922859216. The cubic root of 166213 is about 54.9821429633.

Adding to 166213 its reverse (312661), we get a palindrome (478874).

The spelling of 166213 in words is "one hundred sixty-six thousand, two hundred thirteen".