668383 has 4 divisors (see below), whose sum is σ = 681048. Its totient is φ = 655720.

The previous prime is 668347. The next prime is 668407. The reversal of 668383 is 383866.

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-668383 is a prime.

It is a Duffinian number.

668383 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668303) 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, 6253 + ... + 6358.

It is an arithmetic number, because the mean of its divisors is an integer number (170262).

2⁶⁶⁸³⁸³ is an apocalyptic number.

668383 is a deficient number, since it is larger than the sum of its proper divisors (12665).

668383 is a wasteful number, since it uses less digits than its factorization.

668383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

The product of its digits is 20736, while the sum is 34.

The square root of 668383 is about 817.5469405484. The cubic root of 668383 is about 87.4329499942.

The spelling of 668383 in words is "six hundred sixty-eight thousand, three hundred eighty-three".