66666666666 is nontrivially palindromic in base 10.
66666666666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a nude number because it is divisible by every one of its digits.
66666666666 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
Almost surely, 266666666666 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66666666666 is a wasteful number, since it uses less digits than its factorization.
66666666666 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 534893.
The spelling of 66666666666 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".