9966638267 has 2 divisors, whose sum is σ = 9966638268. Its totient is φ = 9966638266.

The previous prime is 9966638261. The next prime is 9966638327. The reversal of 9966638267 is 7628366699.

9966638267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9966638267 - 2⁶ = 9966638203 is a prime.

It is not a weakly prime, because it can be changed into another prime (9966638261) 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 as a sum of consecutive naturals, namely, 4983319133 + 4983319134.

It is an arithmetic number, because the mean of its divisors is an integer number (4983319134).

Almost surely, 2^9966638267 is an apocalyptic number.

9966638267 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966638267 is an equidigital number, since it uses as much as digits as its factorization.

9966638267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35271936, while the sum is 62.

The square root of 9966638267 is about 99833.0519767877. The cubic root of 9966638267 is about 2152.0361649228.

The spelling of 9966638267 in words is "nine billion, nine hundred sixty-six million, six hundred thirty-eight thousand, two hundred sixty-seven".