8666768991 has 4 divisors (see below), whose sum is σ = 11555691992. Its totient is φ = 5777845992.

The previous prime is 8666768917. The next prime is 8666769011. The reversal of 8666768991 is 1998676668.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8666768991 - 2¹⁴ = 8666752607 is a prime.

It is a super-2 number, since 2×8666768991² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666768911) 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, 1444461496 + ... + 1444461501.

It is an arithmetic number, because the mean of its divisors is an integer number (2888922998).

Almost surely, 2^8666768991 is an apocalyptic number.

8666768991 is a deficient number, since it is larger than the sum of its proper divisors (2888923001).

8666768991 is a wasteful number, since it uses less digits than its factorization.

8666768991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2888923000.

The product of its digits is 47029248, while the sum is 66.

The square root of 8666768991 is about 93095.4831933322. The cubic root of 8666768991 is about 2054.0881331552.

The spelling of 8666768991 in words is "eight billion, six hundred sixty-six million, seven hundred sixty-eight thousand, nine hundred ninety-one".