166857 has 4 divisors (see below), whose sum is σ = 222480. Its totient is φ = 111236.

The previous prime is 166853. The next prime is 166861. The reversal of 166857 is 758661.

166857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758661 = 3 ⋅252887.

It is an interprime number because it is at equal distance from previous prime (166853) and next prime (166861).

It is a cyclic number.

It is not a de Polignac number, because 166857 - 2² = 166853 is a prime.

It is a D-number.

166857 is a lucky number.

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 in 3 ways as a sum of consecutive naturals, for example, 27807 + ... + 27812.

It is an arithmetic number, because the mean of its divisors is an integer number (55620).

2¹⁶⁶⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

166857 is a deficient number, since it is larger than the sum of its proper divisors (55623).

166857 is an equidigital number, since it uses as much as digits as its factorization.

166857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55622.

The product of its digits is 10080, while the sum is 33.

The square root of 166857 is about 408.4813337229. The cubic root of 166857 is about 55.0530617394.

The spelling of 166857 in words is "one hundred sixty-six thousand, eight hundred fifty-seven".