844658068544 has 56 divisors (see below), whose sum is σ = 1695263081400. Its totient is φ = 417506918400.

The previous prime is 844658068537. The next prime is 844658068591. The reversal of 844658068544 is 445860856448.

It can be written as a sum of positive squares in 4 ways, for example, as 21283308544 + 823374760000 = 145888^2 + 907400^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42647444 + ... + 42667244.

It is an arithmetic number, because the mean of its divisors is an integer number (30272555025).

Almost surely, 2^844658068544 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 844658068544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847631540700).

844658068544 is an abundant number, since it is smaller than the sum of its proper divisors (850605012856).

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

844658068544 is a wasteful number, since it uses less digits than its factorization.

844658068544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27391 (or 27381 counting only the distinct ones).

The product of its (nonzero) digits is 117964800, while the sum is 62.

The spelling of 844658068544 in words is "eight hundred forty-four billion, six hundred fifty-eight million, sixty-eight thousand, five hundred forty-four".