68840681976 is a `hidden beast` number, since 6 + 88 + 406 + 81 + 9 + 76 = 666.
It is a congruent number.
Almost surely, 268840681976 is an apocalyptic number.
68840681976 is a gapful number since it is divisible by the number (66) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 68840681976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107079310800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
68840681976 is a wasteful number, since it uses less digits than its factorization.
68840681976 is an odious number, because the sum of its binary digits is odd.
The spelling of 68840681976 in words is "sixty-eight billion, eight hundred forty million, six hundred eighty-one thousand, nine hundred seventy-six".