685309043853 has 32 divisors (see below), whose sum is σ = 1160633560320. Its totient is φ = 391496509440.

The previous prime is 685309043851. The next prime is 685309043891. The reversal of 685309043853 is 358340903586.

It is a happy number.

685309043853 is a `hidden beast` number, since 68 + 530 + 9 + 0 + 43 + 8 + 5 + 3 = 666.

It is not a de Polignac number, because 685309043853 - 2¹ = 685309043851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685309043853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685309043851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182373 + ... + 1184853.

It is an arithmetic number, because the mean of its divisors is an integer number (36269798760).

Almost surely, 2^685309043853 is an apocalyptic number.

685309043853 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

685309043853 is a deficient number, since it is larger than the sum of its proper divisors (475324516467).

685309043853 is a wasteful number, since it uses less digits than its factorization.

685309043853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006114 (or 1006108 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 685309043853 in words is "six hundred eighty-five billion, three hundred nine million, forty-three thousand, eight hundred fifty-three".