66799 has 4 divisors (see below), whose sum is σ = 67864. Its totient is φ = 65736.

The previous prime is 66797. The next prime is 66809. The reversal of 66799 is 99766.

66799 = 103² + 104² + ... + 108².

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

It is a cyclic number.

It is not a de Polignac number, because 66799 - 2¹ = 66797 is a prime.

It is a Duffinian number.

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 (66791) 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, 432 + ... + 565.

It is an arithmetic number, because the mean of its divisors is an integer number (16966).

2⁶⁶⁷⁹⁹ is an apocalyptic number.

66799 is a deficient number, since it is larger than the sum of its proper divisors (1065).

66799 is an equidigital number, since it uses as much as digits as its factorization.

66799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064.

The product of its digits is 20412, while the sum is 37.

The square root of 66799 is about 258.4550251011. The cubic root of 66799 is about 40.5748248401.

The spelling of 66799 in words is "sixty-six thousand, seven hundred ninety-nine".