844732221218 has 6 divisors (see below), whose sum is σ = 1267100281521. Its totient is φ = 422365460712.

The previous prime is 844732221043. The next prime is 844732221227. The reversal of 844732221218 is 812122237448.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 544359169249 + 300373051969 = 737807^2 + 548063^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=649897.

It is a super-3 number, since 3×844732221218³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 974846 + ... + 1624742.

Almost surely, 2^844732221218 is an apocalyptic number.

844732221218 is a deficient number, since it is larger than the sum of its proper divisors (422368060303).

844732221218 is an frugal number, since it uses more digits than its factorization.

844732221218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299796 (or 649899 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The spelling of 844732221218 in words is "eight hundred forty-four billion, seven hundred thirty-two million, two hundred twenty-one thousand, two hundred eighteen".