66805768848 has 160 divisors (see below), whose sum is σ = 213682323456. Its totient is φ = 17513409024.

The previous prime is 66805768847. The next prime is 66805768849. The reversal of 66805768848 is 84886750866.

It is an interprime number because it is at equal distance from previous prime (66805768847) and next prime (66805768849).

It is not an unprimeable number, because it can be changed into a prime (66805768847) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 683665 + ... + 775247.

Almost surely, 2^66805768848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66805768848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106841161728).

66805768848 is an abundant number, since it is smaller than the sum of its proper divisors (146876554608).

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

66805768848 is a wasteful number, since it uses less digits than its factorization.

66805768848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91781 (or 91775 counting only the distinct ones).

The product of its (nonzero) digits is 123863040, while the sum is 66.

The spelling of 66805768848 in words is "sixty-six billion, eight hundred five million, seven hundred sixty-eight thousand, eight hundred forty-eight".