844664221872 has 60 divisors (see below), whose sum is σ = 2388256681720. Its totient is φ = 278652109824.

The previous prime is 844664221859. The next prime is 844664221889. The reversal of 844664221872 is 278122466448.

It is a happy number.

844664221872 is a `hidden beast` number, since 84 + 4 + 66 + 422 + 1 + 87 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30221722 + ... + 30249657.

Almost surely, 2^844664221872 is an apocalyptic number.

It is an amenable number.

844664221872 is an abundant number, since it is smaller than the sum of its proper divisors (1543592459848).

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

844664221872 is a wasteful number, since it uses less digits than its factorization.

844664221872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60471490 (or 60471481 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 54.

The spelling of 844664221872 in words is "eight hundred forty-four billion, six hundred sixty-four million, two hundred twenty-one thousand, eight hundred seventy-two".