866763806558144 has 28 divisors (see below), whose sum is σ = 1876346649425688. Its totient is φ = 393983548435200.

The previous prime is 866763806558093. The next prime is 866763806558171. The reversal of 866763806558144 is 441855608367668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615599293727 + ... + 615599295134.

Almost surely, 2^{866763806558144} is an apocalyptic number.

It is an amenable number.

866763806558144 is an abundant number, since it is smaller than the sum of its proper divisors (1009582842867544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866763806558144 is a wasteful number, since it uses less digits than its factorization.

866763806558144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231198588884 (or 1231198588874 counting only the distinct ones).

The product of its (nonzero) digits is 5573836800, while the sum is 77.

The spelling of 866763806558144 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, eight hundred six million, five hundred fifty-eight thousand, one hundred forty-four".