166871 has 2 divisors, whose sum is σ = 166872. Its totient is φ = 166870.

The previous prime is 166867. The next prime is 166909. The reversal of 166871 is 178661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166871 - 2² = 166867 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83435 + 83436.

It is an arithmetic number, because the mean of its divisors is an integer number (83436).

2¹⁶⁶⁸⁷¹ is an apocalyptic number.

166871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166871 is an equidigital number, since it uses as much as digits as its factorization.

166871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 166871 is about 408.4984700094. The cubic root of 166871 is about 55.0546014237.

The spelling of 166871 in words is "one hundred sixty-six thousand, eight hundred seventy-one".