866443613142844 has 24 divisors (see below), whose sum is σ = 1654120495230336. Its totient is φ = 393837798798000.

The previous prime is 866443613142841. The next prime is 866443613142851. The reversal of 866443613142844 is 448241316344668.

It is a super-2 number, since 2×866443613142844² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866443613142841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106443999 + ... + 114294409.

It is an arithmetic number, because the mean of its divisors is an integer number (68921687301264).

Almost surely, 2^{866443613142844} is an apocalyptic number.

It is an amenable number.

866443613142844 is a deficient number, since it is larger than the sum of its proper divisors (787676882087492).

866443613142844 is a wasteful number, since it uses less digits than its factorization.

866443613142844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10358817 (or 10358815 counting only the distinct ones).

The product of its digits is 254803968, while the sum is 64.

The spelling of 866443613142844 in words is "eight hundred sixty-six trillion, four hundred forty-three billion, six hundred thirteen million, one hundred forty-two thousand, eight hundred forty-four".