It is a sphenic number, since it is the product of 3 distinct primes.
It is a Duffinian number.
It is a congruent number.
Almost surely, 266788655688767 is an apocalyptic number.
66788655688767 is a wasteful number, since it uses less digits than its factorization.
66788655688767 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5954238893.
Subtracting 66788655688767 from its reverse (76788655688766), we obtain a palindrome (9999999999999).
The spelling of 66788655688767 in words is "sixty-six trillion, seven hundred eighty-eight billion, six hundred fifty-five million, six hundred eighty-eight thousand, seven hundred sixty-seven".