668603 has 4 divisors (see below), whose sum is σ = 720048. Its totient is φ = 617160.

The previous prime is 668599. The next prime is 668609. The reversal of 668603 is 306866.

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 668603 - 2² = 668599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668609) 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, 25703 + ... + 25728.

It is an arithmetic number, because the mean of its divisors is an integer number (180012).

2⁶⁶⁸⁶⁰³ is an apocalyptic number.

668603 is a deficient number, since it is larger than the sum of its proper divisors (51445).

668603 is a wasteful number, since it uses less digits than its factorization.

668603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51444.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 668603 is about 817.6814783276. The cubic root of 668603 is about 87.4425418694.

The spelling of 668603 in words is "six hundred sixty-eight thousand, six hundred three".