685338566 has 16 divisors (see below), whose sum is σ = 1128895488. Its totient is φ = 309453000.

The previous prime is 685338551. The next prime is 685338583. The reversal of 685338566 is 665833586.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 99830 + ... + 106473.

It is an arithmetic number, because the mean of its divisors is an integer number (70555968).

Almost surely, 2^685338566 is an apocalyptic number.

685338566 is a deficient number, since it is larger than the sum of its proper divisors (443556922).

685338566 is a wasteful number, since it uses less digits than its factorization.

685338566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206467.

The product of its digits is 3110400, while the sum is 50.

The square root of 685338566 is about 26178.9718285497. The cubic root of 685338566 is about 881.6611898242.

The spelling of 685338566 in words is "six hundred eighty-five million, three hundred thirty-eight thousand, five hundred sixty-six".