688643303 has 2 divisors, whose sum is σ = 688643304. Its totient is φ = 688643302.

The previous prime is 688643243. The next prime is 688643369. The reversal of 688643303 is 303346886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688643303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688643003) 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, 344321651 + 344321652.

It is an arithmetic number, because the mean of its divisors is an integer number (344321652).

Almost surely, 2^688643303 is an apocalyptic number.

688643303 is a deficient number, since it is larger than the sum of its proper divisors (1).

688643303 is an equidigital number, since it uses as much as digits as its factorization.

688643303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 688643303 is about 26242.0140804779. The cubic root of 688643303 is about 883.0760562550.

The spelling of 688643303 in words is "six hundred eighty-eight million, six hundred forty-three thousand, three hundred three".