66638888883666 has 96 divisors (see below), whose sum is σ = 164366159548032. Its totient is φ = 19314704090880.

The previous prime is 66638888883641. The next prime is 66638888883703.

66638888883666 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98818206 + ... + 99490278.

It is an arithmetic number, because the mean of its divisors is an integer number (1712147495292).

Almost surely, 2^{66638888883666} is an apocalyptic number.

66638888883666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66638888883666 is an abundant number, since it is smaller than the sum of its proper divisors (97727270664366).

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

66638888883666 is a wasteful number, since it uses less digits than its factorization.

66638888883666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693888 (or 693885 counting only the distinct ones).

The product of its digits is 110075314176, while the sum is 90.

The spelling of 66638888883666 in words is "sixty-six trillion, six hundred thirty-eight billion, eight hundred eighty-eight million, eight hundred eighty-three thousand, six hundred sixty-six".