685556646 has 16 divisors (see below), whose sum is σ = 1408170864. Its totient is φ = 222342624.

The previous prime is 685556629. The next prime is 685556657. The reversal of 685556646 is 646655586.

685556646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1543825 + ... + 1544268.

It is an arithmetic number, because the mean of its divisors is an integer number (88010679).

Almost surely, 2^685556646 is an apocalyptic number.

685556646 is an abundant number, since it is smaller than the sum of its proper divisors (722614218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685556646 is a wasteful number, since it uses less digits than its factorization.

685556646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088135.

The product of its digits is 5184000, while the sum is 51.

The square root of 685556646 is about 26183.1366722935. The cubic root of 685556646 is about 881.7546970293.

The spelling of 685556646 in words is "six hundred eighty-five million, five hundred fifty-six thousand, six hundred forty-six".