866189945824 has 48 divisors (see below), whose sum is σ = 1951212600288. Its totient is φ = 370788982272.

The previous prime is 866189945779. The next prime is 866189945851. The reversal of 866189945824 is 428549981668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075587 + ... + 2457730.

It is an arithmetic number, because the mean of its divisors is an integer number (40650262506).

Almost surely, 2^866189945824 is an apocalyptic number.

It is an amenable number.

866189945824 is an abundant number, since it is smaller than the sum of its proper divisors (1085022654464).

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

866189945824 is a wasteful number, since it uses less digits than its factorization.

866189945824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4534187 (or 4534179 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 70.

The spelling of 866189945824 in words is "eight hundred sixty-six billion, one hundred eighty-nine million, nine hundred forty-five thousand, eight hundred twenty-four".