166205207 has 12 divisors (see below), whose sum is σ = 197457120. Its totient is φ = 139428576.

The previous prime is 166205203. The next prime is 166205213. The reversal of 166205207 is 702502661.

166205207 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166205207 - 2² = 166205203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166205207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166205201) 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, 33782 + ... + 38387.

It is an arithmetic number, because the mean of its divisors is an integer number (16454760).

Almost surely, 2^166205207 is an apocalyptic number.

166205207 is a deficient number, since it is larger than the sum of its proper divisors (31251913).

166205207 is an equidigital number, since it uses as much as digits as its factorization.

166205207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72230 (or 72223 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 166205207 is about 12892.0598431748. The cubic root of 166205207 is about 549.8128365915.

Adding to 166205207 its reverse (702502661), we get a palindrome (868707868).

The spelling of 166205207 in words is "one hundred sixty-six million, two hundred five thousand, two hundred seven".