766638836668 has 12 divisors (see below), whose sum is σ = 1341624094272. Its totient is φ = 383317666880.

The previous prime is 766638836549. The next prime is 766638836773. The reversal of 766638836668 is 866638836667.

It is a self number, because there is not a number n which added to its sum of digits gives 766638836668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496196 + ... + 1942132.

It is an arithmetic number, because the mean of its divisors is an integer number (111802007856).

Almost surely, 2^766638836668 is an apocalyptic number.

It is an amenable number.

766638836668 is a deficient number, since it is larger than the sum of its proper divisors (574985257604).

766638836668 is a wasteful number, since it uses less digits than its factorization.

766638836668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875732 (or 875730 counting only the distinct ones).

The product of its digits is 1504935936, while the sum is 73.

Subtracting 766638836668 from its reverse (866638836667), we obtain a palindrome (99999999999).

The spelling of 766638836668 in words is "seven hundred sixty-six billion, six hundred thirty-eight million, eight hundred thirty-six thousand, six hundred sixty-eight".