866786278583587 has 2 divisors, whose sum is σ = 866786278583588. Its totient is φ = 866786278583586.

The previous prime is 866786278583527. The next prime is 866786278583629. The reversal of 866786278583587 is 785385872687668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866786278583587 - 2²³ = 866786270194979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866786278583495 and 866786278583504.

It is not a weakly prime, because it can be changed into another prime (866786278583527) 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, 433393139291793 + 433393139291794.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139291794).

Almost surely, 2^{866786278583587} is an apocalyptic number.

866786278583587 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278583587 is an equidigital number, since it uses as much as digits as its factorization.

866786278583587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364157337600, while the sum is 94.

The spelling of 866786278583587 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, five hundred eighty-seven".