12568863805621 has 2 divisors, whose sum is σ = 12568863805622. Its totient is φ = 12568863805620.

The previous prime is 12568863805583. The next prime is 12568863805639. The reversal of 12568863805621 is 12650836886521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8658812367396 + 3910051438225 = 2942586^2 + 1977385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12568863805621 - 2¹³ = 12568863797429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12568863805621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12568863805651) 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, 6284431902810 + 6284431902811.

It is an arithmetic number, because the mean of its divisors is an integer number (6284431902811).

Almost surely, 2^{12568863805621} is an apocalyptic number.

It is an amenable number.

12568863805621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12568863805621 is an equidigital number, since it uses as much as digits as its factorization.

12568863805621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33177600, while the sum is 61.

The spelling of 12568863805621 in words is "twelve trillion, five hundred sixty-eight billion, eight hundred sixty-three million, eight hundred five thousand, six hundred twenty-one".