866155318051241 has 2 divisors, whose sum is σ = 866155318051242. Its totient is φ = 866155318051240.

The previous prime is 866155318051211. The next prime is 866155318051253. The reversal of 866155318051241 is 142150813551668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855913301952016 + 10242016099225 = 29255996^2 + 3200315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866155318051241 is a prime.

It is not a weakly prime, because it can be changed into another prime (866155318051211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433077659025620 + 433077659025621.

It is an arithmetic number, because the mean of its divisors is an integer number (433077659025621).

Almost surely, 2^{866155318051241} is an apocalyptic number.

It is an amenable number.

866155318051241 is a deficient number, since it is larger than the sum of its proper divisors (1).

866155318051241 is an equidigital number, since it uses as much as digits as its factorization.

866155318051241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912000, while the sum is 56.

The spelling of 866155318051241 in words is "eight hundred sixty-six trillion, one hundred fifty-five billion, three hundred eighteen million, fifty-one thousand, two hundred forty-one".