671166 has 24 divisors (see below), whose sum is σ = 1509144. Its totient is φ = 223560.

The previous prime is 671161. The next prime is 671189. The reversal of 671166 is 661176.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671161) by changing a digit.

671166 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (62881).

2⁶⁷¹¹⁶⁶ is an apocalyptic number.

671166 is an abundant number, since it is smaller than the sum of its proper divisors (837978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671166 is a wasteful number, since it uses less digits than its factorization.

671166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1386 counting only the distinct ones).

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

The square root of 671166 is about 819.2472154362. The cubic root of 671166 is about 87.5541324900.

The spelling of 671166 in words is "six hundred seventy-one thousand, one hundred sixty-six".