66686488468666 has 16 divisors (see below), whose sum is σ = 110203773926688. Its totient is φ = 30011921002000.

The previous prime is 66686488468631. The next prime is 66686488468871.

66686488468666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15005958280 + ... + 15005962723.

It is an arithmetic number, because the mean of its divisors is an integer number (6887735870418).

Almost surely, 2^{66686488468666} is an apocalyptic number.

66686488468666 is a deficient number, since it is larger than the sum of its proper divisors (43517285458022).

66686488468666 is a wasteful number, since it uses less digits than its factorization.

66686488468666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30011921117.

The product of its digits is 110075314176, while the sum is 88.

The spelling of 66686488468666 in words is "sixty-six trillion, six hundred eighty-six billion, four hundred eighty-eight million, four hundred sixty-eight thousand, six hundred sixty-six".