166111271 has 4 divisors (see below), whose sum is σ = 166166952. Its totient is φ = 166055592.

The previous prime is 166111261. The next prime is 166111273. The reversal of 166111271 is 172111661.

It is a happy number.

166111271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166111271 - 2²² = 161916967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166111271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166111273) 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, 23096 + ... + 29421.

It is an arithmetic number, because the mean of its divisors is an integer number (41541738).

Almost surely, 2^166111271 is an apocalyptic number.

166111271 is a deficient number, since it is larger than the sum of its proper divisors (55681).

166111271 is an equidigital number, since it uses as much as digits as its factorization.

166111271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55680.

The product of its digits is 504, while the sum is 26.

The square root of 166111271 is about 12888.4161556027. The cubic root of 166111271 is about 549.7092358428.

The spelling of 166111271 in words is "one hundred sixty-six million, one hundred eleven thousand, two hundred seventy-one".