166204211 has 4 divisors (see below), whose sum is σ = 166238400. Its totient is φ = 166170024.

The previous prime is 166204183. The next prime is 166204219. The reversal of 166204211 is 112402661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112402661 = 7 ⋅16057523.

It is a cyclic number.

It is not a de Polignac number, because 166204211 - 2⁶ = 166204147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166204219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8291 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (41559600).

Almost surely, 2^166204211 is an apocalyptic number.

166204211 is a deficient number, since it is larger than the sum of its proper divisors (34189).

166204211 is an equidigital number, since it uses as much as digits as its factorization.

166204211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34188.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 166204211 is about 12892.0212146893. The cubic root of 166204211 is about 549.8117383213.

Adding to 166204211 its reverse (112402661), we get a palindrome (278606872).

The spelling of 166204211 in words is "one hundred sixty-six million, two hundred four thousand, two hundred eleven".