866786278584973 has 2 divisors, whose sum is σ = 866786278584974. Its totient is φ = 866786278584972.

The previous prime is 866786278584953. The next prime is 866786278585079. The reversal of 866786278584973 is 379485872687668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744857466973929 + 121928811611044 = 27292077^2 + 11042138^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786278584973 - 2⁴⁹ = 303836325163661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866786278584943) 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, 433393139292486 + 433393139292487.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139292487).

Almost surely, 2^{866786278584973} is an apocalyptic number.

It is an amenable number.

866786278584973 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278584973 is an equidigital number, since it uses as much as digits as its factorization.

866786278584973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 327741603840, while the sum is 94.

The spelling of 866786278584973 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-four thousand, nine hundred seventy-three".