66888888886666 has 32 divisors (see below), whose sum is σ = 127643784796800. Its totient is φ = 26060606056800.

The previous prime is 66888888886657. The next prime is 66888888886747. The reversal of 66888888886666 is 66668888888866.

66888888886666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4432068315 + ... + 4432083406.

It is an arithmetic number, because the mean of its divisors is an integer number (3988868274900).

It is a self-describing number.

Almost surely, 2^{66888888886666} is an apocalyptic number.

66888888886666 is a deficient number, since it is larger than the sum of its proper divisors (60754895910134).

66888888886666 is a wasteful number, since it uses less digits than its factorization.

66888888886666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8864151755 (or 8864151741 counting only the distinct ones).

The product of its digits is 782757789696, while the sum is 100.

The spelling of 66888888886666 in words is "sixty-six trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-six thousand, six hundred sixty-six".