681768866 has 8 divisors (see below), whose sum is σ = 1022796624. Its totient is φ = 340836660.

The previous prime is 681768847. The next prime is 681768907. The reversal of 681768866 is 668867186.

It is a happy number.

681768866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060 + ... + 36983.

It is an arithmetic number, because the mean of its divisors is an integer number (127849578).

Almost surely, 2^681768866 is an apocalyptic number.

681768866 is a deficient number, since it is larger than the sum of its proper divisors (341027758).

681768866 is a wasteful number, since it uses less digits than its factorization.

681768866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47776.

The product of its digits is 4644864, while the sum is 56.

The square root of 681768866 is about 26110.7040502549. The cubic root of 681768866 is about 880.1277646793.

The spelling of 681768866 in words is "six hundred eighty-one million, seven hundred sixty-eight thousand, eight hundred sixty-six".