166163213 has 8 divisors (see below), whose sum is σ = 167475000. Its totient is φ = 164855808.

The previous prime is 166163191. The next prime is 166163233. The reversal of 166163213 is 312361661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42797764 + 123365449 = 6542^2 + 11107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166163213 - 2⁸ = 166162957 is a prime.

It is a super-2 number, since 2×166163213² = 55220426708966738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166163233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132413 + ... + 133661.

It is an arithmetic number, because the mean of its divisors is an integer number (20934375).

Almost surely, 2^166163213 is an apocalyptic number.

It is an amenable number.

166163213 is a deficient number, since it is larger than the sum of its proper divisors (1311787).

166163213 is a wasteful number, since it uses less digits than its factorization.

166163213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191.

The product of its digits is 3888, while the sum is 29.

The square root of 166163213 is about 12890.4310633896. The cubic root of 166163213 is about 549.7665268007.

The spelling of 166163213 in words is "one hundred sixty-six million, one hundred sixty-three thousand, two hundred thirteen".