680791866858 has 12 divisors (see below), whose sum is σ = 1475049044898. Its totient is φ = 226930622280.

The previous prime is 680791866857. The next prime is 680791866883. The reversal of 680791866858 is 858668197086.

It can be written as a sum of positive squares in only one way, i.e., 486334680129 + 194457186729 = 697377^2 + 440973^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (680791866857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18910885173 + ... + 18910885208.

Almost surely, 2^680791866858 is an apocalyptic number.

680791866858 is an abundant number, since it is smaller than the sum of its proper divisors (794257178040).

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

680791866858 is a wasteful number, since it uses less digits than its factorization.

680791866858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37821770389 (or 37821770386 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 72.

The spelling of 680791866858 in words is "six hundred eighty billion, seven hundred ninety-one million, eight hundred sixty-six thousand, eight hundred fifty-eight".