166863 has 4 divisors (see below), whose sum is σ = 222488. Its totient is φ = 111240.

The previous prime is 166861. The next prime is 166867. The reversal of 166863 is 368661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368661 = 3 ⋅122887.

It is not a de Polignac number, because 166863 - 2¹ = 166861 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 166863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166861) 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 in 3 ways as a sum of consecutive naturals, for example, 27808 + ... + 27813.

It is an arithmetic number, because the mean of its divisors is an integer number (55622).

2¹⁶⁶⁸⁶³ is an apocalyptic number.

166863 is a deficient number, since it is larger than the sum of its proper divisors (55625).

166863 is an equidigital number, since it uses as much as digits as its factorization.

166863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55624.

The product of its digits is 5184, while the sum is 30.

The square root of 166863 is about 408.4886779337. The cubic root of 166863 is about 55.0537216147.

The spelling of 166863 in words is "one hundred sixty-six thousand, eight hundred sixty-three".