9966889966 has 32 divisors (see below), whose sum is σ = 17183881728. Its totient is φ = 4291335840.

The previous prime is 9966889963. The next prime is 9966889993. The reversal of 9966889966 is 6699886699.

9966889966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

9966889966 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9966889892 and 9966889901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966889963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43501 + ... + 147736.

It is an arithmetic number, because the mean of its divisors is an integer number (536996304).

Almost surely, 2^9966889966 is an apocalyptic number.

9966889966 is a deficient number, since it is larger than the sum of its proper divisors (7216991762).

9966889966 is a wasteful number, since it uses less digits than its factorization.

9966889966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191376.

The product of its digits is 544195584, while the sum is 76.

The square root of 9966889966 is about 99834.3125683750. The cubic root of 9966889966 is about 2152.0542807200.

The spelling of 9966889966 in words is "nine billion, nine hundred sixty-six million, eight hundred eighty-nine thousand, nine hundred sixty-six".