844479820813 has 4 divisors (see below), whose sum is σ = 844485861340. Its totient is φ = 844473780288.

The previous prime is 844479820799. The next prime is 844479820819. The reversal of 844479820813 is 318028974448.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48640979209 + 795838841604 = 220547^2 + 892098^2 .

It is a cyclic number.

It is not a de Polignac number, because 844479820813 - 2¹³ = 844479812621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844479820819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2805468 + ... + 3091861.

It is an arithmetic number, because the mean of its divisors is an integer number (211121465335).

Almost surely, 2^844479820813 is an apocalyptic number.

It is an amenable number.

844479820813 is a deficient number, since it is larger than the sum of its proper divisors (6040527).

844479820813 is a wasteful number, since it uses less digits than its factorization.

844479820813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040526.

The product of its (nonzero) digits is 12386304, while the sum is 58.

The spelling of 844479820813 in words is "eight hundred forty-four billion, four hundred seventy-nine million, eight hundred twenty thousand, eight hundred thirteen".