166639201 has 4 divisors (see below), whose sum is σ = 168986304. Its totient is φ = 164292100.

The previous prime is 166639181. The next prime is 166639223. The reversal of 166639201 is 102936661.

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 166639201 - 2⁵ = 166639169 is a prime.

It is a super-3 number, since 3×166639201³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166639001) 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, 1173445 + ... + 1173586.

It is an arithmetic number, because the mean of its divisors is an integer number (42246576).

Almost surely, 2^166639201 is an apocalyptic number.

It is an amenable number.

166639201 is a deficient number, since it is larger than the sum of its proper divisors (2347103).

166639201 is an equidigital number, since it uses as much as digits as its factorization.

166639201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347102.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 166639201 is about 12908.8807028340. The cubic root of 166639201 is about 550.2909766107.

The spelling of 166639201 in words is "one hundred sixty-six million, six hundred thirty-nine thousand, two hundred one".