668503 has 4 divisors (see below), whose sum is σ = 729288. Its totient is φ = 607720.

The previous prime is 668471. The next prime is 668509. The reversal of 668503 is 305866.

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 668503 - 2⁵ = 668471 is a prime.

It is a super-2 number, since 2×668503² = 893792522018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30376 + ... + 30397.

It is an arithmetic number, because the mean of its divisors is an integer number (182322).

2⁶⁶⁸⁵⁰³ is an apocalyptic number.

668503 is a deficient number, since it is larger than the sum of its proper divisors (60785).

668503 is a wasteful number, since it uses less digits than its factorization.

668503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60784.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 668503 is about 817.6203275360. The cubic root of 668503 is about 87.4381821870.

The spelling of 668503 in words is "six hundred sixty-eight thousand, five hundred three".