66666166666 has 32 divisors (see below), whose sum is σ = 117274936320. Its totient is φ = 28097103600.

The previous prime is 66666166649. The next prime is 66666166681.

66666166666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1677040 + ... + 1716331.

It is an arithmetic number, because the mean of its divisors is an integer number (3664841760).

Almost surely, 2^66666166666 is an apocalyptic number.

66666166666 is a deficient number, since it is larger than the sum of its proper divisors (50608769654).

66666166666 is a wasteful number, since it uses less digits than its factorization.

66666166666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393450.

The product of its digits is 60466176, while the sum is 61.

It can be divided in two parts, 66666 and 166666, that added together give a palindrome (233332).

The spelling of 66666166666 in words is "sixty-six billion, six hundred sixty-six million, one hundred sixty-six thousand, six hundred sixty-six".