666171 has 16 divisors (see below), whose sum is σ = 1077120. Its totient is φ = 403560.

The previous prime is 666167. The next prime is 666173. The reversal of 666171 is 171666.

666171 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 666171 - 2² = 666167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (666173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (67320).

2⁶⁶⁶¹⁷¹ is an apocalyptic number.

666171 is a deficient number, since it is larger than the sum of its proper divisors (410949).

666171 is a wasteful number, since it uses less digits than its factorization.

666171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2257 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 666171 is about 816.1929918837. The cubic root of 666171 is about 87.3363908699.

The spelling of 666171 in words is "six hundred sixty-six thousand, one hundred seventy-one".