166823 has 2 divisors, whose sum is σ = 166824. Its totient is φ = 166822.

The previous prime is 166807. The next prime is 166841. The reversal of 166823 is 328661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166823 - 2⁴ = 166807 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 166792 and 166801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83411 + 83412.

It is an arithmetic number, because the mean of its divisors is an integer number (83412).

2¹⁶⁶⁸²³ is an apocalyptic number.

166823 is a deficient number, since it is larger than the sum of its proper divisors (1).

166823 is an equidigital number, since it uses as much as digits as its factorization.

166823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 166823 is about 408.4397140338. The cubic root of 166823 is about 55.0493221475.

It can be divided in two parts, 166 and 823, that added together give a palindrome (989).

The spelling of 166823 in words is "one hundred sixty-six thousand, eight hundred twenty-three".