685566612 has 192 divisors, whose sum is σ = 1986969600. Its totient is φ = 203575680.

The previous prime is 685566533. The next prime is 685566613. The reversal of 685566612 is 216665586.

It is a happy number.

685566612 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 not an unprimeable number, because it can be changed into a prime (685566613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2232963 + ... + 2233269.

It is an arithmetic number, because the mean of its divisors is an integer number (10348800).

Almost surely, 2^685566612 is an apocalyptic number.

685566612 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685566612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993484800).

685566612 is an abundant number, since it is smaller than the sum of its proper divisors (1301402988).

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

685566612 is a wasteful number, since it uses less digits than its factorization.

685566612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 395 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 685566612 is about 26183.3269849345. The cubic root of 685566612 is about 881.7589697250.

The spelling of 685566612 in words is "six hundred eighty-five million, five hundred sixty-six thousand, six hundred twelve".