66299 has 4 divisors (see below), whose sum is σ = 66864. Its totient is φ = 65736.

The previous prime is 66293. The next prime is 66301. The reversal of 66299 is 99266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99266 = 2 ⋅49633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66299 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (66293) 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, 32 + ... + 365.

It is an arithmetic number, because the mean of its divisors is an integer number (16716).

2⁶⁶²⁹⁹ is an apocalyptic number.

66299 is a deficient number, since it is larger than the sum of its proper divisors (565).

66299 is a wasteful number, since it uses less digits than its factorization.

66299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its digits is 5832, while the sum is 32.

The square root of 66299 is about 257.4859219453. The cubic root of 66299 is about 40.4733350872.

The spelling of 66299 in words is "sixty-six thousand, two hundred ninety-nine".