7686666866 has 24 divisors (see below), whose sum is σ = 12194127504. Its totient is φ = 3633469560.

The previous prime is 7686666863. The next prime is 7686666881. The reversal of 7686666866 is 6686666867.

It is not an unprimeable number, because it can be changed into a prime (7686666863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343661 + ... + 365343.

It is an arithmetic number, because the mean of its divisors is an integer number (508088646).

Almost surely, 2^7686666866 is an apocalyptic number.

7686666866 is a deficient number, since it is larger than the sum of its proper divisors (4507460638).

7686666866 is a wasteful number, since it uses less digits than its factorization.

7686666866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22214 (or 22195 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 65.

The square root of 7686666866 is about 87673.6383755117. The cubic root of 7686666866 is about 1973.5403938422.

Subtracting from 7686666866 its reverse (6686666867), we obtain a palindrome (999999999).

The spelling of 7686666866 in words is "seven billion, six hundred eighty-six million, six hundred sixty-six thousand, eight hundred sixty-six".