866763831987289 has 2 divisors, whose sum is σ = 866763831987290. Its totient is φ = 866763831987288.

The previous prime is 866763831987239. The next prime is 866763831987299. The reversal of 866763831987289 is 982789138367668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676765396531225 + 189998435456064 = 26014715^2 + 13783992^2 .

It is a cyclic number.

It is not a de Polignac number, because 866763831987289 - 2¹⁷ = 866763831856217 is a prime.

It is not a weakly prime, because it can be changed into another prime (866763831987239) 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, 433381915993644 + 433381915993645.

It is an arithmetic number, because the mean of its divisors is an integer number (433381915993645).

Almost surely, 2^{866763831987289} is an apocalyptic number.

It is an amenable number.

866763831987289 is a deficient number, since it is larger than the sum of its proper divisors (1).

866763831987289 is an equidigital number, since it uses as much as digits as its factorization.

866763831987289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63207309312, while the sum is 91.

The spelling of 866763831987289 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, eight hundred thirty-one million, nine hundred eighty-seven thousand, two hundred eighty-nine".