66422878866 has 24 divisors (see below), whose sum is σ = 145341154764. Its totient is φ = 21921741600.

The previous prime is 66422878807. The next prime is 66422878877. The reversal of 66422878866 is 66887822466.

It is a happy number.

66422878866 is a `hidden beast` number, since 66 + 422 + 8 + 78 + 86 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48828182841 + 17594696025 = 220971^2 + 132645^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18266301 + ... + 18269936.

Almost surely, 2^66422878866 is an apocalyptic number.

66422878866 is an abundant number, since it is smaller than the sum of its proper divisors (78918275898).

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

66422878866 is a wasteful number, since it uses less digits than its factorization.

66422878866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36536346 (or 36536343 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 63.

The spelling of 66422878866 in words is "sixty-six billion, four hundred twenty-two million, eight hundred seventy-eight thousand, eight hundred sixty-six".