8166788666 has 12 divisors (see below), whose sum is σ = 12590221518. Its totient is φ = 3973030992.

The previous prime is 8166788611. The next prime is 8166788671. The reversal of 8166788666 is 6668876618.

It can be written as a sum of positive squares in 3 ways, for example, as 8148853441 + 17935225 = 90271^2 + 4235^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8166788599 and 8166788608.

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 5 ways as a sum of consecutive naturals, for example, 1488641 + ... + 1494116.

Almost surely, 2^8166788666 is an apocalyptic number.

8166788666 is a deficient number, since it is larger than the sum of its proper divisors (4423432852).

8166788666 is a wasteful number, since it uses less digits than its factorization.

8166788666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982833 (or 2982796 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 62.

The square root of 8166788666 is about 90370.2864109659. The cubic root of 8166788666 is about 2013.8035670919.

The spelling of 8166788666 in words is "eight billion, one hundred sixty-six million, seven hundred eighty-eight thousand, six hundred sixty-six".