866786278523707 has 2 divisors, whose sum is σ = 866786278523708. Its totient is φ = 866786278523706.

The previous prime is 866786278523663. The next prime is 866786278523747. The reversal of 866786278523707 is 707325872687668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866786278523707 is a prime.

It is a super-2 number, since 2×866786278523707² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866786278523747) 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, 433393139261853 + 433393139261854.

It is an arithmetic number, because the mean of its divisors is an integer number (433393139261854).

Almost surely, 2^{866786278523707} is an apocalyptic number.

866786278523707 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786278523707 is an equidigital number, since it uses as much as digits as its factorization.

866786278523707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15931883520, while the sum is 82.

The spelling of 866786278523707 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred twenty-three thousand, seven hundred seven".