866205775410869 has 2 divisors, whose sum is σ = 866205775410870. Its totient is φ = 866205775410868.

The previous prime is 866205775410853. The next prime is 866205775410901. The reversal of 866205775410869 is 968014577502668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606838390128100 + 259367385282769 = 24634090^2 + 16104887^2 .

It is a cyclic number.

It is not a de Polignac number, because 866205775410869 - 2⁴ = 866205775410853 is a prime.

It is a super-2 number, since 2×866205775410869² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866205775410796 and 866205775410805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866205075410869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433102887705434 + 433102887705435.

It is an arithmetic number, because the mean of its divisors is an integer number (433102887705435).

Almost surely, 2^{866205775410869} is an apocalyptic number.

It is an amenable number.

866205775410869 is a deficient number, since it is larger than the sum of its proper divisors (1).

866205775410869 is an equidigital number, since it uses as much as digits as its factorization.

866205775410869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1219276800, while the sum is 74.

The spelling of 866205775410869 in words is "eight hundred sixty-six trillion, two hundred five billion, seven hundred seventy-five million, four hundred ten thousand, eight hundred sixty-nine".