9876640638889 has 2 divisors, whose sum is σ = 9876640638890. Its totient is φ = 9876640638888.

The previous prime is 9876640638863. The next prime is 9876640638913. The reversal of 9876640638889 is 9888360466789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8449253697600 + 1427386941289 = 2906760^2 + 1194733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9876640638889 is a prime.

It is not a weakly prime, because it can be changed into another prime (9876640638289) 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, 4938320319444 + 4938320319445.

It is an arithmetic number, because the mean of its divisors is an integer number (4938320319445).

Almost surely, 2^{9876640638889} is an apocalyptic number.

It is an amenable number.

9876640638889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9876640638889 is an equidigital number, since it uses as much as digits as its factorization.

9876640638889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6019743744, while the sum is 82.

The spelling of 9876640638889 in words is "nine trillion, eight hundred seventy-six billion, six hundred forty million, six hundred thirty-eight thousand, eight hundred eighty-nine".