668903 has 2 divisors, whose sum is σ = 668904. Its totient is φ = 668902.

The previous prime is 668879. The next prime is 668929. The reversal of 668903 is 309866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668903 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 668903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668963) 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 as a sum of consecutive naturals, namely, 334451 + 334452.

It is an arithmetic number, because the mean of its divisors is an integer number (334452).

2⁶⁶⁸⁹⁰³ is an apocalyptic number.

668903 is a deficient number, since it is larger than the sum of its proper divisors (1).

668903 is an equidigital number, since it uses as much as digits as its factorization.

668903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 668903 is about 817.8649032695. The cubic root of 668903 is about 87.4556183089.

The spelling of 668903 in words is "six hundred sixty-eight thousand, nine hundred three".