866786383716241 has 2 divisors, whose sum is σ = 866786383716242. Its totient is φ = 866786383716240.

The previous prime is 866786383716221. The next prime is 866786383716287. The reversal of 866786383716241 is 142617383687668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619950988404225 + 246835395312016 = 24898815^2 + 15710996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866786383716241 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786383716221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393191858120 + 433393191858121.

It is an arithmetic number, because the mean of its divisors is an integer number (433393191858121).

Almost surely, 2^{866786383716241} is an apocalyptic number.

It is an amenable number.

866786383716241 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786383716241 is an equidigital number, since it uses as much as digits as its factorization.

866786383716241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2341011456, while the sum is 76.

The spelling of 866786383716241 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, three hundred eighty-three million, seven hundred sixteen thousand, two hundred forty-one".