685533503 has 2 divisors, whose sum is σ = 685533504. Its totient is φ = 685533502.

The previous prime is 685533479. The next prime is 685533557. The reversal of 685533503 is 305335586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685533503 - 2¹⁶ = 685467967 is a prime.

It is a Chen prime.

It is equal to p_35541956 and since 685533503 and 35541956 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685533203) 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, 342766751 + 342766752.

It is an arithmetic number, because the mean of its divisors is an integer number (342766752).

Almost surely, 2^685533503 is an apocalyptic number.

685533503 is a deficient number, since it is larger than the sum of its proper divisors (1).

685533503 is an equidigital number, since it uses as much as digits as its factorization.

685533503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 685533503 is about 26182.6947238056. The cubic root of 685533503 is about 881.7447748351.

The spelling of 685533503 in words is "six hundred eighty-five million, five hundred thirty-three thousand, five hundred three".