866443616513265 has 48 divisors (see below), whose sum is σ = 1613519197057152. Its totient is φ = 395874060132096.

The previous prime is 866443616513207. The next prime is 866443616513269. The reversal of 866443616513265 is 562315616344668.

It is not a de Polignac number, because 866443616513265 - 2¹³ = 866443616505073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866443616513196 and 866443616513205.

It is not an unprimeable number, because it can be changed into a prime (866443616513269) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317763964 + ... + 320479053.

It is an arithmetic number, because the mean of its divisors is an integer number (33614983272024).

Almost surely, 2^{866443616513265} is an apocalyptic number.

It is an amenable number.

866443616513265 is a deficient number, since it is larger than the sum of its proper divisors (747075580543887).

866443616513265 is a wasteful number, since it uses less digits than its factorization.

866443616513265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638244886 (or 638244879 counting only the distinct ones).

The product of its digits is 447897600, while the sum is 66.

The spelling of 866443616513265 in words is "eight hundred sixty-six trillion, four hundred forty-three billion, six hundred sixteen million, five hundred thirteen thousand, two hundred sixty-five".