166201 has 4 divisors (see below), whose sum is σ = 189952. Its totient is φ = 142452.

The previous prime is 166189. The next prime is 166207. The reversal of 166201 is 102661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166201 - 2⁵ = 166169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11865 + ... + 11878.

It is an arithmetic number, because the mean of its divisors is an integer number (47488).

2¹⁶⁶²⁰¹ is an apocalyptic number.

It is an amenable number.

166201 is a deficient number, since it is larger than the sum of its proper divisors (23751).

166201 is an equidigital number, since it uses as much as digits as its factorization.

166201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23750.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 166201 is about 407.6775686741. The cubic root of 166201 is about 54.9808197583.

Adding to 166201 its reverse (102661), we get a palindrome (268862).

The spelling of 166201 in words is "one hundred sixty-six thousand, two hundred one".