66805775185 has 8 divisors (see below), whose sum is σ = 80174356416. Its totient is φ = 53439669360.

The previous prime is 66805775149. The next prime is 66805775207. The reversal of 66805775185 is 58157750866.

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

It is a de Polignac number, because none of the positive numbers 2^k-66805775185 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 558949 + ... + 667858.

It is an arithmetic number, because the mean of its divisors is an integer number (10021794552).

Almost surely, 2^66805775185 is an apocalyptic number.

It is an amenable number.

66805775185 is a deficient number, since it is larger than the sum of its proper divisors (13368581231).

66805775185 is a wasteful number, since it uses less digits than its factorization.

66805775185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237703.

The product of its (nonzero) digits is 14112000, while the sum is 58.

The spelling of 66805775185 in words is "sixty-six billion, eight hundred five million, seven hundred seventy-five thousand, one hundred eighty-five".