866821088323 has 4 divisors (see below), whose sum is σ = 886979718328. Its totient is φ = 846662458320.

The previous prime is 866821088303. The next prime is 866821088339. The reversal of 866821088323 is 323880128668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866821088323 - 2⁵ = 866821088291 is a prime.

It is a super-2 number, since 2×866821088323² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866821088303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10079314938 + ... + 10079315023.

It is an arithmetic number, because the mean of its divisors is an integer number (221744929582).

Almost surely, 2^866821088323 is an apocalyptic number.

866821088323 is a deficient number, since it is larger than the sum of its proper divisors (20158630005).

866821088323 is a wasteful number, since it uses less digits than its factorization.

866821088323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20158630004.

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 866821088323 in words is "eight hundred sixty-six billion, eight hundred twenty-one million, eighty-eight thousand, three hundred twenty-three".