9966214856 has 64 divisors (see below), whose sum is σ = 21345508800. Its totient is φ = 4324320000.

The previous prime is 9966214813. The next prime is 9966214889. The reversal of 9966214856 is 6584126699.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239606 + ... + 278106.

It is an arithmetic number, because the mean of its divisors is an integer number (333523575).

Almost surely, 2^9966214856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9966214856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10672754400).

9966214856 is an abundant number, since it is smaller than the sum of its proper divisors (11379293944).

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

9966214856 is a wasteful number, since it uses less digits than its factorization.

9966214856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38670 (or 38666 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 56.

The square root of 9966214856 is about 99830.9313589731. The cubic root of 9966214856 is about 2152.0056896290.

The spelling of 9966214856 in words is "nine billion, nine hundred sixty-six million, two hundred fourteen thousand, eight hundred fifty-six".