166856 has 8 divisors (see below), whose sum is σ = 312870. Its totient is φ = 83424.

The previous prime is 166853. The next prime is 166861. The reversal of 166856 is 658661.

166856 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 70756 = 310^2 + 266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (166853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421 + ... + 10436.

2¹⁶⁶⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

166856 is a deficient number, since it is larger than the sum of its proper divisors (146014).

166856 is a wasteful number, since it uses less digits than its factorization.

166856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863 (or 20859 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 166856 is about 408.4801096749. The cubic root of 166856 is about 55.0529517587.

The spelling of 166856 in words is "one hundred sixty-six thousand, eight hundred fifty-six".