66199 has 8 divisors (see below), whose sum is σ = 77600. Its totient is φ = 56448.

The previous prime is 66191. The next prime is 66221. The reversal of 66199 is 99166.

It is not a de Polignac number, because 66199 - 2³ = 66191 is a prime.

66199 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247 + ... + 439.

It is an arithmetic number, because the mean of its divisors is an integer number (9700).

2⁶⁶¹⁹⁹ is an apocalyptic number.

66199 is a deficient number, since it is larger than the sum of its proper divisors (11401).

66199 is an equidigital number, since it uses as much as digits as its factorization.

66199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 200 counting only the distinct ones).

The product of its digits is 2916, while the sum is 31.

The square root of 66199 is about 257.2916632928. The cubic root of 66199 is about 40.4529759561.

The spelling of 66199 in words is "sixty-six thousand, one hundred ninety-nine".