685884622837 has 8 divisors (see below), whose sum is σ = 692743386456. Its totient is φ = 679052704512.

The previous prime is 685884622793. The next prime is 685884622849. The reversal of 685884622837 is 738226488586.

It can be written as a sum of positive squares in 4 ways, for example, as 353565808996 + 332318813841 = 594614^2 + 576471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685884622837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685884622867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6659968 + ... + 6762169.

It is an arithmetic number, because the mean of its divisors is an integer number (86592923307).

Almost surely, 2^685884622837 is an apocalyptic number.

It is an amenable number.

685884622837 is a deficient number, since it is larger than the sum of its proper divisors (6858763619).

685884622837 is a wasteful number, since it uses less digits than its factorization.

685884622837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13422647.

The product of its digits is 247726080, while the sum is 67.

The spelling of 685884622837 in words is "six hundred eighty-five billion, eight hundred eighty-four million, six hundred twenty-two thousand, eight hundred thirty-seven".