9966443748637 has 2 divisors, whose sum is σ = 9966443748638. Its totient is φ = 9966443748636.

The previous prime is 9966443748607. The next prime is 9966443748649. The reversal of 9966443748637 is 7368473446699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9934183637316 + 32260111321 = 3151854^2 + 179611^2 .

It is a cyclic number.

It is not a de Polignac number, because 9966443748637 - 2³⁵ = 9932084010269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9966443748607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983221874318 + 4983221874319.

It is an arithmetic number, because the mean of its divisors is an integer number (4983221874319).

Almost surely, 2^{9966443748637} is an apocalyptic number.

It is an amenable number.

9966443748637 is a deficient number, since it is larger than the sum of its proper divisors (1).

9966443748637 is an equidigital number, since it uses as much as digits as its factorization.

9966443748637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3950456832, while the sum is 76.

The spelling of 9966443748637 in words is "nine trillion, nine hundred sixty-six billion, four hundred forty-three million, seven hundred forty-eight thousand, six hundred thirty-seven".