9966550555 has 16 divisors (see below), whose sum is σ = 13439845440. Its totient is φ = 7039916928.

The previous prime is 9966550541. The next prime is 9966550571. The reversal of 9966550555 is 5550556699.

9966550555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9966550555 - 2⁵ = 9966550523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9966550496 and 9966550505.

It is an unprimeable number.

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, 3331800 + ... + 3334789.

It is an arithmetic number, because the mean of its divisors is an integer number (839990340).

Almost surely, 2^9966550555 is an apocalyptic number.

9966550555 is a deficient number, since it is larger than the sum of its proper divisors (3473294885).

9966550555 is a wasteful number, since it uses less digits than its factorization.

9966550555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666630.

The product of its (nonzero) digits is 9112500, while the sum is 55.

The square root of 9966550555 is about 99832.6126824296. The cubic root of 9966550555 is about 2152.0298518630.

The spelling of 9966550555 in words is "nine billion, nine hundred sixty-six million, five hundred fifty thousand, five hundred fifty-five".