166004213 has 4 divisors (see below), whose sum is σ = 166034688. Its totient is φ = 165973740.

The previous prime is 166004191. The next prime is 166004239. The reversal of 166004213 is 312400661.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 312400661 = 1879 ⋅166259.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166004213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166004413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4583 + ... + 18788.

It is an arithmetic number, because the mean of its divisors is an integer number (41508672).

Almost surely, 2^166004213 is an apocalyptic number.

It is an amenable number.

166004213 is a deficient number, since it is larger than the sum of its proper divisors (30475).

166004213 is an equidigital number, since it uses as much as digits as its factorization.

166004213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30474.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 166004213 is about 12884.2622217960. The cubic root of 166004213 is about 549.5911153834.

Adding to 166004213 its reverse (312400661), we get a palindrome (478404874).

The spelling of 166004213 in words is "one hundred sixty-six million, four thousand, two hundred thirteen".