685737971712 has 208 divisors, whose sum is σ = 2033370535680. Its totient is φ = 228376608768.

The previous prime is 685737971707. The next prime is 685737971731. The reversal of 685737971712 is 217179737586.

It is a self number, because there is not a number n which added to its sum of digits gives 685737971712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175065178 + ... + 175069094.

Almost surely, 2^685737971712 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 685737971712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016685267840).

685737971712 is an abundant number, since it is smaller than the sum of its proper divisors (1347632563968).

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

685737971712 is a wasteful number, since it uses less digits than its factorization.

685737971712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533 (or 5505 counting only the distinct ones).

The product of its digits is 31116960, while the sum is 63.

The spelling of 685737971712 in words is "six hundred eighty-five billion, seven hundred thirty-seven million, nine hundred seventy-one thousand, seven hundred twelve".