685338503 has 2 divisors, whose sum is σ = 685338504. Its totient is φ = 685338502.

The previous prime is 685338473. The next prime is 685338517. The reversal of 685338503 is 305833586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685338503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685338583) 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, 342669251 + 342669252.

It is an arithmetic number, because the mean of its divisors is an integer number (342669252).

Almost surely, 2^685338503 is an apocalyptic number.

685338503 is a deficient number, since it is larger than the sum of its proper divisors (1).

685338503 is an equidigital number, since it uses as much as digits as its factorization.

685338503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 685338503 is about 26178.9706252939. The cubic root of 685338503 is about 881.6611628085.

The spelling of 685338503 in words is "six hundred eighty-five million, three hundred thirty-eight thousand, five hundred three".