866243354296291 has 2 divisors, whose sum is σ = 866243354296292. Its totient is φ = 866243354296290.

The previous prime is 866243354296253. The next prime is 866243354296337. The reversal of 866243354296291 is 192692453342668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866243354296291 - 2¹⁹ = 866243353772003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866243354296291.

It is not a weakly prime, because it can be changed into another prime (866243354296891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433121677148145 + 433121677148146.

It is an arithmetic number, because the mean of its divisors is an integer number (433121677148146).

Almost surely, 2^{866243354296291} is an apocalyptic number.

866243354296291 is a deficient number, since it is larger than the sum of its proper divisors (1).

866243354296291 is an equidigital number, since it uses as much as digits as its factorization.

866243354296291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806215680, while the sum is 70.

The spelling of 866243354296291 in words is "eight hundred sixty-six trillion, two hundred forty-three billion, three hundred fifty-four million, two hundred ninety-six thousand, two hundred ninety-one".