9873661056529 has 2 divisors, whose sum is σ = 9873661056530. Its totient is φ = 9873661056528.

The previous prime is 9873661056527. The next prime is 9873661056607. The reversal of 9873661056529 is 9256501663789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7646248084225 + 2227412972304 = 2765185^2 + 1492452^2 .

It is a cyclic number.

It is not a de Polignac number, because 9873661056529 - 2¹ = 9873661056527 is a prime.

Together with 9873661056527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9873661056527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936830528264 + 4936830528265.

It is an arithmetic number, because the mean of its divisors is an integer number (4936830528265).

Almost surely, 2^{9873661056529} is an apocalyptic number.

It is an amenable number.

9873661056529 is a deficient number, since it is larger than the sum of its proper divisors (1).

9873661056529 is an equidigital number, since it uses as much as digits as its factorization.

9873661056529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 146966400, while the sum is 67.

The spelling of 9873661056529 in words is "nine trillion, eight hundred seventy-three billion, six hundred sixty-one million, fifty-six thousand, five hundred twenty-nine".