13161321344 has 64 divisors (see below), whose sum is σ = 26676896400. Its totient is φ = 6466437120.

The previous prime is 13161321323. The next prime is 13161321353. The reversal of 13161321344 is 44312316131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 3951872 + ... + 3955200.

Almost surely, 2^13161321344 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 13161321344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13338448200).

13161321344 is an abundant number, since it is smaller than the sum of its proper divisors (13515575056).

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

13161321344 is an equidigital number, since it uses as much as digits as its factorization.

13161321344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3859 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

Adding to 13161321344 its reverse (44312316131), we get a palindrome (57473637475).

The spelling of 13161321344 in words is "thirteen billion, one hundred sixty-one million, three hundred twenty-one thousand, three hundred forty-four".