866786513766077 has 2 divisors, whose sum is σ = 866786513766078. Its totient is φ = 866786513766076.

The previous prime is 866786513766071. The next prime is 866786513766137. The reversal of 866786513766077 is 770667315687668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533381519262916 + 333404994503161 = 23095054^2 + 18259381^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786513766077 - 2²⁰ = 866786512717501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866786513765986 and 866786513766004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866786513766071) 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, 433393256883038 + 433393256883039.

It is an arithmetic number, because the mean of its divisors is an integer number (433393256883039).

Almost surely, 2^{866786513766077} is an apocalyptic number.

It is an amenable number.

866786513766077 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786513766077 is an equidigital number, since it uses as much as digits as its factorization.

866786513766077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17923368960, while the sum is 83.

The spelling of 866786513766077 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred thirteen million, seven hundred sixty-six thousand, seventy-seven".