685099876608 has 504 divisors, whose sum is σ = 2400594408576. Its totient is φ = 190953676800.

The previous prime is 685099876553. The next prime is 685099876613. The reversal of 685099876608 is 806678990586.

It is a happy number.

685099876608 is a `hidden beast` number, since 6 + 8 + 5 + 0 + 9 + 9 + 8 + 7 + 6 + 608 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 53554693 + ... + 53567483.

It is an arithmetic number, because the mean of its divisors is an integer number (4763084144).

Almost surely, 2^685099876608 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 685099876608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1200297204288).

685099876608 is an abundant number, since it is smaller than the sum of its proper divisors (1715494531968).

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

685099876608 is an equidigital number, since it uses as much as digits as its factorization.

685099876608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12873 (or 12844 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 72.

The spelling of 685099876608 in words is "six hundred eighty-five billion, ninety-nine million, eight hundred seventy-six thousand, six hundred eight".