681963799 has 12 divisors (see below), whose sum is σ = 747564120. Its totient is φ = 616976160.

The previous prime is 681963791. The next prime is 681963803. The reversal of 681963799 is 997369186.

681963799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681963799 - 2³ = 681963791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681963791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1339557 + ... + 1340065.

It is an arithmetic number, because the mean of its divisors is an integer number (62297010).

Almost surely, 2^681963799 is an apocalyptic number.

681963799 is a deficient number, since it is larger than the sum of its proper divisors (65600321).

681963799 is an equidigital number, since it uses as much as digits as its factorization.

681963799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218 (or 869 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 58.

The square root of 681963799 is about 26114.4366012365. The cubic root of 681963799 is about 880.2116394377.

The spelling of 681963799 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, seven hundred ninety-nine".