681899999994 has 12 divisors (see below), whose sum is σ = 1477450000026. Its totient is φ = 227299999992.

The previous prime is 681899999993. The next prime is 681899999999. The reversal of 681899999994 is 499999998186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 600837368769 + 81062631225 = 775137^2 + 284715^2 .

It is not an unprimeable number, because it can be changed into a prime (681899999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18941666649 + ... + 18941666684.

Almost surely, 2^681899999994 is an apocalyptic number.

681899999994 is an abundant number, since it is smaller than the sum of its proper divisors (795550000032).

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

681899999994 is a wasteful number, since it uses less digits than its factorization.

681899999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37883333341 (or 37883333338 counting only the distinct ones).

The product of its digits is 7346640384, while the sum is 90.

The spelling of 681899999994 in words is "six hundred eighty-one billion, eight hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".