166771 has 4 divisors (see below), whose sum is σ = 181944. Its totient is φ = 151600.

The previous prime is 166741. The next prime is 166781. The reversal of 166771 is 177661.

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 166771 - 2⁵ = 166739 is a prime.

It is a Duffinian number.

166771 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (166741) 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, 7570 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (45486).

2¹⁶⁶⁷⁷¹ is an apocalyptic number.

166771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166771 is a deficient number, since it is larger than the sum of its proper divisors (15173).

166771 is a wasteful number, since it uses less digits than its factorization.

166771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15172.

The product of its digits is 1764, while the sum is 28.

The square root of 166771 is about 408.3760521872. The cubic root of 166771 is about 55.0436017888.

The spelling of 166771 in words is "one hundred sixty-six thousand, seven hundred seventy-one".