66884648866 has 24 divisors (see below), whose sum is σ = 116889067116. Its totient is φ = 28620103680.

The previous prime is 66884648851. The next prime is 66884648867.

66884648866 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 55969623241 + 10915025625 = 236579^2 + 104475^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66884648795 and 66884648804.

It is not an unprimeable number, because it can be changed into a prime (66884648867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469551 + ... + 595186.

Almost surely, 2^66884648866 is an apocalyptic number.

66884648866 is a deficient number, since it is larger than the sum of its proper divisors (50004418250).

66884648866 is a wasteful number, since it uses less digits than its factorization.

66884648866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065394 (or 1065387 counting only the distinct ones).

The product of its digits is 509607936, while the sum is 70.

The spelling of 66884648866 in words is "sixty-six billion, eight hundred eighty-four million, six hundred forty-eight thousand, eight hundred sixty-six".