866786278381167 has 16 divisors (see below), whose sum is σ = 1182594635659008. Its totient is φ = 564417776919360.

The previous prime is 866786278381091. The next prime is 866786278381181. The reversal of 866786278381167 is 761183872687668.

It is not a de Polignac number, because 866786278381167 - 2¹⁵ = 866786278348399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866786278381167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786278381187) 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 in 15 ways as a sum of consecutive naturals, for example, 56226742 + ... + 69964412.

It is an arithmetic number, because the mean of its divisors is an integer number (73912164728688).

Almost surely, 2^{866786278381167} is an apocalyptic number.

866786278381167 is a deficient number, since it is larger than the sum of its proper divisors (315808357277841).

866786278381167 is a wasteful number, since it uses less digits than its factorization.

866786278381167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14226830.

The product of its digits is 10924720128, while the sum is 84.

The spelling of 866786278381167 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, three hundred eighty-one thousand, one hundred sixty-seven".