66916766782 has 8 divisors (see below), whose sum is σ = 100427625936. Its totient is φ = 33440891472.

The previous prime is 66916766779. The next prime is 66916766803. The reversal of 66916766782 is 28766761966.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8741178 + ... + 8748829.

It is an arithmetic number, because the mean of its divisors is an integer number (12553453242).

Almost surely, 2^66916766782 is an apocalyptic number.

66916766782 is a deficient number, since it is larger than the sum of its proper divisors (33510859154).

66916766782 is a wasteful number, since it uses less digits than its factorization.

66916766782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17491922.

The product of its digits is 54867456, while the sum is 64.

The spelling of 66916766782 in words is "sixty-six billion, nine hundred sixteen million, seven hundred sixty-six thousand, seven hundred eighty-two".