668683 has 4 divisors (see below), whose sum is σ = 670320. Its totient is φ = 667048.

The previous prime is 668677. The next prime is 668687. The reversal of 668683 is 386866.

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: 386866 = 2 ⋅193433.

It is a cyclic number.

It is not a de Polignac number, because 668683 - 2¹⁷ = 537611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668687) 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, 378 + ... + 1216.

It is an arithmetic number, because the mean of its divisors is an integer number (167580).

2⁶⁶⁸⁶⁸³ is an apocalyptic number.

668683 is a deficient number, since it is larger than the sum of its proper divisors (1637).

668683 is an equidigital number, since it uses as much as digits as its factorization.

668683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its digits is 41472, while the sum is 37.

The square root of 668683 is about 817.7303956684. The cubic root of 668683 is about 87.4460293023.

The spelling of 668683 in words is "six hundred sixty-eight thousand, six hundred eighty-three".