64656884666 has 16 divisors (see below), whose sum is σ = 105813908928. Its totient is φ = 29386233600.

The previous prime is 64656884641. The next prime is 64656884693. The reversal of 64656884666 is 66648865646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45851 + ... + 362513.

It is an arithmetic number, because the mean of its divisors is an integer number (6613369308).

Almost surely, 2^64656884666 is an apocalyptic number.

64656884666 is a deficient number, since it is larger than the sum of its proper divisors (41157024262).

64656884666 is a wasteful number, since it uses less digits than its factorization.

64656884666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325957.

The product of its digits is 238878720, while the sum is 65.

The spelling of 64656884666 in words is "sixty-four billion, six hundred fifty-six million, eight hundred eighty-four thousand, six hundred sixty-six".