668946503 has 2 divisors, whose sum is σ = 668946504. Its totient is φ = 668946502.

The previous prime is 668946479. The next prime is 668946541. The reversal of 668946503 is 305649866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668946503 - 2⁸ = 668946247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668946403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334473251 + 334473252.

It is an arithmetic number, because the mean of its divisors is an integer number (334473252).

Almost surely, 2^668946503 is an apocalyptic number.

668946503 is a deficient number, since it is larger than the sum of its proper divisors (1).

668946503 is an equidigital number, since it uses as much as digits as its factorization.

668946503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 668946503 is about 25864.0001353232. Note that the first 3 decimals coincide. The cubic root of 668946503 is about 874.5751419876.

The spelling of 668946503 in words is "six hundred sixty-eight million, nine hundred forty-six thousand, five hundred three".