668299 has 4 divisors (see below), whose sum is σ = 672336. Its totient is φ = 664264.

The previous prime is 668273. The next prime is 668303. The reversal of 668299 is 992866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668299 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (668209) 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, 1759 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (168084).

2⁶⁶⁸²⁹⁹ is an apocalyptic number.

668299 is a deficient number, since it is larger than the sum of its proper divisors (4037).

668299 is a wasteful number, since it uses less digits than its factorization.

668299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036.

The product of its digits is 46656, while the sum is 40.

The square root of 668299 is about 817.4955657372. The cubic root of 668299 is about 87.4292870866.

The spelling of 668299 in words is "six hundred sixty-eight thousand, two hundred ninety-nine".