9866756894369 has 2 divisors, whose sum is σ = 9866756894370. Its totient is φ = 9866756894368.

The previous prime is 9866756894279. The next prime is 9866756894399. The reversal of 9866756894369 is 9634986576689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8819040877969 + 1047716016400 = 2969687^2 + 1023580^2 .

It is an emirp because it is prime and its reverse (9634986576689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9866756894369 - 2¹⁶ = 9866756828833 is a prime.

It is a super-2 number, since 2×9866756894369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9866756894399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933378447184 + 4933378447185.

It is an arithmetic number, because the mean of its divisors is an integer number (4933378447185).

Almost surely, 2^{9866756894369} is an apocalyptic number.

It is an amenable number.

9866756894369 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866756894369 is an equidigital number, since it uses as much as digits as its factorization.

9866756894369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25395793920, while the sum is 86.

The spelling of 9866756894369 in words is "nine trillion, eight hundred sixty-six billion, seven hundred fifty-six million, eight hundred ninety-four thousand, three hundred sixty-nine".