999888887666 has 8 divisors (see below), whose sum is σ = 1499936676480. Its totient is φ = 499909995508.

The previous prime is 999888887629. The next prime is 999888887693. The reversal of 999888887666 is 666788888999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17187866 + ... + 17245941.

It is an arithmetic number, because the mean of its divisors is an integer number (187492084560).

Almost surely, 2^999888887666 is an apocalyptic number.

999888887666 is a deficient number, since it is larger than the sum of its proper divisors (500047788814).

999888887666 is a wasteful number, since it uses less digits than its factorization.

999888887666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34448328.

The product of its digits is 36118462464, while the sum is 92.

The spelling of 999888887666 in words is "nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred eighty-seven thousand, six hundred sixty-six".