685659157312 has 56 divisors (see below), whose sum is σ = 1397854838016. Its totient is φ = 333450091008.

The previous prime is 685659157237. The next prime is 685659157331. The reversal of 685659157312 is 213751956586.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7110573 + ... + 7206355.

It is an arithmetic number, because the mean of its divisors is an integer number (24961693536).

Almost surely, 2^685659157312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685659157312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698927419008).

685659157312 is an abundant number, since it is smaller than the sum of its proper divisors (712195680704).

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

685659157312 is a wasteful number, since it uses less digits than its factorization.

685659157312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98855 (or 98845 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 58.

The spelling of 685659157312 in words is "six hundred eighty-five billion, six hundred fifty-nine million, one hundred fifty-seven thousand, three hundred twelve".