166899 has 4 divisors (see below), whose sum is σ = 222536. Its totient is φ = 111264.

The previous prime is 166871. The next prime is 166909. The reversal of 166899 is 998661.

166899 is digitally balanced in base 7, 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 an emirpimes, since its reverse is a distinct semiprime: 998661 = 3 ⋅332887.

It is not a de Polignac number, because 166899 - 2⁵ = 166867 is a prime.

It is a D-number.

It is a Duffinian number.

166899 is strictly pandigital in base 7.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166849) 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, 27814 + ... + 27819.

It is an arithmetic number, because the mean of its divisors is an integer number (55634).

2¹⁶⁶⁸⁹⁹ is an apocalyptic number.

166899 is a deficient number, since it is larger than the sum of its proper divisors (55637).

166899 is an equidigital number, since it uses as much as digits as its factorization.

166899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55636.

The product of its digits is 23328, while the sum is 39.

The square root of 166899 is about 408.5327404260. The cubic root of 166899 is about 55.0576805340.

The spelling of 166899 in words is "one hundred sixty-six thousand, eight hundred ninety-nine".