681333766 has 8 divisors (see below), whose sum is σ = 1038754944. Its totient is φ = 335082120.

The previous prime is 681333739. The next prime is 681333767. The reversal of 681333766 is 667333186.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681333767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2792230 + ... + 2792473.

It is an arithmetic number, because the mean of its divisors is an integer number (129844368).

Almost surely, 2^681333766 is an apocalyptic number.

681333766 is a deficient number, since it is larger than the sum of its proper divisors (357421178).

681333766 is a wasteful number, since it uses less digits than its factorization.

681333766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584766.

The product of its digits is 326592, while the sum is 43.

The square root of 681333766 is about 26102.3708884844. The cubic root of 681333766 is about 879.9404944267.

The spelling of 681333766 in words is "six hundred eighty-one million, three hundred thirty-three thousand, seven hundred sixty-six".