166143213 has 12 divisors (see below), whose sum is σ = 241017660. Its totient is φ = 110285376.

The previous prime is 166143179. The next prime is 166143221. The reversal of 166143213 is 312341661.

166143213 is a `hidden beast` number, since 1 + 6 + 614 + 32 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 92217609 + 73925604 = 9603^2 + 8598^2 .

It is not a de Polignac number, because 166143213 - 2¹² = 166139117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166143293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37518 + ... + 41711.

It is an arithmetic number, because the mean of its divisors is an integer number (20084805).

Almost surely, 2^166143213 is an apocalyptic number.

It is an amenable number.

166143213 is a deficient number, since it is larger than the sum of its proper divisors (74874447).

166143213 is a wasteful number, since it uses less digits than its factorization.

166143213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79468 (or 79465 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 166143213 is about 12889.6552707976. The cubic root of 166143213 is about 549.7444686257.

Adding to 166143213 its reverse (312341661), we get a palindrome (478484874).

The spelling of 166143213 in words is "one hundred sixty-six million, one hundred forty-three thousand, two hundred thirteen".