666779857754 has 8 divisors (see below), whose sum is σ = 1043655429600. Its totient is φ = 318894714556.

The previous prime is 666779857703. The next prime is 666779857759. The reversal of 666779857754 is 457758977666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (666779857759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7247607104 + ... + 7247607195.

It is an arithmetic number, because the mean of its divisors is an integer number (130456928700).

Almost surely, 2^666779857754 is an apocalyptic number.

666779857754 is a deficient number, since it is larger than the sum of its proper divisors (376875571846).

666779857754 is a wasteful number, since it uses less digits than its factorization.

666779857754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14495214324.

The product of its digits is 3734035200, while the sum is 77.

The spelling of 666779857754 in words is "six hundred sixty-six billion, seven hundred seventy-nine million, eight hundred fifty-seven thousand, seven hundred fifty-four".