844645818672 has 480 divisors, whose sum is σ = 2610377369600. Its totient is φ = 253957939200.

The previous prime is 844645818671. The next prime is 844645818677. The reversal of 844645818672 is 276818546448.

It is a happy number.

844645818672 is a `hidden beast` number, since 8 + 4 + 46 + 4 + 581 + 8 + 6 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (844645818671) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1950682968 + ... + 1950683400.

Almost surely, 2^844645818672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 844645818672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305188684800).

844645818672 is an abundant number, since it is smaller than the sum of its proper divisors (1765731550928).

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

844645818672 is a wasteful number, since it uses less digits than its factorization.

844645818672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 808 counting only the distinct ones).

The product of its digits is 82575360, while the sum is 63.

The spelling of 844645818672 in words is "eight hundred forty-four billion, six hundred forty-five million, eight hundred eighteen thousand, six hundred seventy-two".