66648884666 has 32 divisors (see below), whose sum is σ = 125905600128. Its totient is φ = 25753412160.

The previous prime is 66648884581. The next prime is 66648884677.

It is a happy number.

66648884666 is nontrivially palindromic in base 10.

66648884666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66648884596 and 66648884605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4250345 + ... + 4265996.

It is an arithmetic number, because the mean of its divisors is an integer number (3934550004).

Almost surely, 2^66648884666 is an apocalyptic number.

66648884666 is a deficient number, since it is larger than the sum of its proper divisors (59256715462).

66648884666 is a wasteful number, since it uses less digits than its factorization.

66648884666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8516406.

The product of its digits is 382205952, while the sum is 68.

The spelling of 66648884666 in words is "sixty-six billion, six hundred forty-eight million, eight hundred eighty-four thousand, six hundred sixty-six".