866223738716389 has 2 divisors, whose sum is σ = 866223738716390. Its totient is φ = 866223738716388.

The previous prime is 866223738716381. The next prime is 866223738716407. The reversal of 866223738716389 is 983617837322668.

866223738716389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 856162522665025 + 10061216051364 = 29260255^2 + 3171942^2 .

It is a cyclic number.

It is not a de Polignac number, because 866223738716389 - 2³ = 866223738716381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866223738716381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433111869358194 + 433111869358195.

It is an arithmetic number, because the mean of its divisors is an integer number (433111869358195).

Almost surely, 2^{866223738716389} is an apocalyptic number.

It is an amenable number.

866223738716389 is a deficient number, since it is larger than the sum of its proper divisors (1).

866223738716389 is an equidigital number, since it uses as much as digits as its factorization.

866223738716389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5267275776, while the sum is 79.

The spelling of 866223738716389 in words is "eight hundred sixty-six trillion, two hundred twenty-three billion, seven hundred thirty-eight million, seven hundred sixteen thousand, three hundred eighty-nine".