66868086866 has 24 divisors (see below), whose sum is σ = 117833233356. Its totient is φ = 28374007200.

The previous prime is 66868086851. The next prime is 66868086869.

66868086866 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 45149875225 + 21718211641 = 212485^2 + 147371^2 .

It is a super-2 number, since 2×66868086866² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66868086796 and 66868086805.

It is not an unprimeable number, because it can be changed into a prime (66868086869) 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, 3367961 + ... + 3387756.

Almost surely, 2^66868086866 is an apocalyptic number.

66868086866 is a deficient number, since it is larger than the sum of its proper divisors (50965146490).

66868086866 is a wasteful number, since it uses less digits than its factorization.

66868086866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755834 (or 6755827 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 68.

The spelling of 66868086866 in words is "sixty-six billion, eight hundred sixty-eight million, eighty-six thousand, eight hundred sixty-six".