681868186 has 16 divisors (see below), whose sum is σ = 1029743136. Its totient is φ = 338628816.

The previous prime is 681868169. The next prime is 681868217.

681868186 is nontrivially palindromic in base 10.

681868186 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190465 + ... + 194011.

It is an arithmetic number, because the mean of its divisors is an integer number (64358946).

Almost surely, 2^681868186 is an apocalyptic number.

681868186 is a deficient number, since it is larger than the sum of its proper divisors (347874950).

681868186 is a wasteful number, since it uses less digits than its factorization.

681868186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173.

The product of its digits is 884736, while the sum is 52.

The square root of 681868186 is about 26112.6058829830. The cubic root of 681868186 is about 880.1705015703.

The spelling of 681868186 in words is "six hundred eighty-one million, eight hundred sixty-eight thousand, one hundred eighty-six".