666779729696 has 24 divisors (see below), whose sum is σ = 1381813256880. Its totient is φ = 315843029568.

The previous prime is 666779729687. The next prime is 666779729719. The reversal of 666779729696 is 696927977666.

It is a self number, because there is not a number n which added to its sum of digits gives 666779729696.

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, 548337986 + ... + 548339201.

It is an arithmetic number, because the mean of its divisors is an integer number (57575552370).

Almost surely, 2^666779729696 is an apocalyptic number.

It is an amenable number.

666779729696 is an abundant number, since it is smaller than the sum of its proper divisors (715033527184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666779729696 is a wasteful number, since it uses less digits than its factorization.

666779729696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096677216 (or 1096677208 counting only the distinct ones).

The product of its digits is 3888730944, while the sum is 80.

The spelling of 666779729696 in words is "six hundred sixty-six billion, seven hundred seventy-nine million, seven hundred twenty-nine thousand, six hundred ninety-six".