864818843581 has 32 divisors (see below), whose sum is σ = 1116360400896. Its totient is φ = 650175768000.

The previous prime is 864818843573. The next prime is 864818843621. The reversal of 864818843581 is 185348818468.

It is not a de Polignac number, because 864818843581 - 2³ = 864818843573 is a prime.

It is a super-2 number, since 2×864818843581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864818843521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242811 + ... + 1337383.

It is an arithmetic number, because the mean of its divisors is an integer number (34886262528).

Almost surely, 2^864818843581 is an apocalyptic number.

It is an amenable number.

864818843581 is a deficient number, since it is larger than the sum of its proper divisors (251541557315).

864818843581 is a wasteful number, since it uses less digits than its factorization.

864818843581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094953.

The product of its digits is 47185920, while the sum is 64.

The spelling of 864818843581 in words is "eight hundred sixty-four billion, eight hundred eighteen million, eight hundred forty-three thousand, five hundred eighty-one".