66686468666 has 8 divisors (see below), whose sum is σ = 101020096404. Its totient is φ = 33013103200.

The previous prime is 66686468659. The next prime is 66686468669.

66686468666 is nontrivially palindromic in base 10.

66686468666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58189500625 + 8496968041 = 241225^2 + 92179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66686468596 and 66686468605.

It is not an unprimeable number, because it can be changed into a prime (66686468669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165065315 + ... + 165065718.

Almost surely, 2^66686468666 is an apocalyptic number.

66686468666 is a deficient number, since it is larger than the sum of its proper divisors (34333627738).

66686468666 is a wasteful number, since it uses less digits than its factorization.

66686468666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330131136.

The product of its digits is 429981696, while the sum is 68.

The spelling of 66686468666 in words is "sixty-six billion, six hundred eighty-six million, four hundred sixty-eight thousand, six hundred sixty-six".