166881 has 16 divisors (see below), whose sum is σ = 262080. Its totient is φ = 93120.

The previous prime is 166871. The next prime is 166909. The reversal of 166881 is 188661.

166881 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 166881 - 2⁵ = 166849 is a prime.

It is a super-2 number, since 2×166881² = 55698536322, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166881.

It is not an unprimeable number, because it can be changed into a prime (166841) 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, 235 + ... + 623.

It is an arithmetic number, because the mean of its divisors is an integer number (16380).

2¹⁶⁶⁸⁸¹ is an apocalyptic number.

166881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166881 is a deficient number, since it is larger than the sum of its proper divisors (95199).

166881 is a wasteful number, since it uses less digits than its factorization.

166881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its digits is 2304, while the sum is 30.

The square root of 166881 is about 408.5107097739. The cubic root of 166881 is about 55.0557011455.

The spelling of 166881 in words is "one hundred sixty-six thousand, eight hundred eighty-one".