166210205 has 12 divisors (see below), whose sum is σ = 232016220. Its totient is φ = 113972544.

The previous prime is 166210169. The next prime is 166210217. The reversal of 166210205 is 502012661.

166210205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37773316 + 128436889 = 6146^2 + 11333^2 .

It is not a de Polignac number, because 166210205 - 2⁶ = 166210141 is a prime.

It is a super-2 number, since 2×166210205² = 55251664492284050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338960 + ... + 339449.

It is an arithmetic number, because the mean of its divisors is an integer number (19334685).

Almost surely, 2^166210205 is an apocalyptic number.

It is an amenable number.

166210205 is a deficient number, since it is larger than the sum of its proper divisors (65806015).

166210205 is an equidigital number, since it uses as much as digits as its factorization.

166210205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678428 (or 678421 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 166210205 is about 12892.2536819596. The cubic root of 166210205 is about 549.8183477246.

Adding to 166210205 its reverse (502012661), we get a palindrome (668222866).

The spelling of 166210205 in words is "one hundred sixty-six million, two hundred ten thousand, two hundred five".