6666556666 has 32 divisors (see below), whose sum is σ = 12486607488. Its totient is φ = 2593343040.

The previous prime is 6666556651. The next prime is 6666556747.

It is a happy number.

6666556666 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6666556666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67416 + ... + 133708.

It is an arithmetic number, because the mean of its divisors is an integer number (390206484).

Almost surely, 2^6666556666 is an apocalyptic number.

6666556666 is a deficient number, since it is larger than the sum of its proper divisors (5820050822).

6666556666 is a wasteful number, since it uses less digits than its factorization.

6666556666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66966.

The product of its digits is 41990400, while the sum is 58.

The square root of 6666556666 is about 81648.9844762322. The cubic root of 6666556666 is about 1882.0617062461.

The spelling of 6666556666 in words is "six billion, six hundred sixty-six million, five hundred fifty-six thousand, six hundred sixty-six".