866818574077 has 2 divisors, whose sum is σ = 866818574078. Its totient is φ = 866818574076.

The previous prime is 866818574021. The next prime is 866818574087. The reversal of 866818574077 is 770475818668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434741103801 + 432077470276 = 659349^2 + 657326^2 .

It is a cyclic number.

It is not a de Polignac number, because 866818574077 - 2¹¹ = 866818572029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866818574087) 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, 433409287038 + 433409287039.

It is an arithmetic number, because the mean of its divisors is an integer number (433409287039).

Almost surely, 2^866818574077 is an apocalyptic number.

It is an amenable number.

866818574077 is a deficient number, since it is larger than the sum of its proper divisors (1).

866818574077 is an equidigital number, since it uses as much as digits as its factorization.

866818574077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126443520, while the sum is 67.

The spelling of 866818574077 in words is "eight hundred sixty-six billion, eight hundred eighteen million, five hundred seventy-four thousand, seventy-seven".