13120444536 has 16 divisors (see below), whose sum is σ = 32801111400. Its totient is φ = 4373481504.

The previous prime is 13120444523. The next prime is 13120444537. The reversal of 13120444536 is 63544402131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13120444497 and 13120444506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120444537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273342571 + ... + 273342618.

Almost surely, 2^13120444536 is an apocalyptic number.

It is an amenable number.

13120444536 is an abundant number, since it is smaller than the sum of its proper divisors (19680666864).

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

13120444536 is a wasteful number, since it uses less digits than its factorization.

13120444536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546685198 (or 546685194 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 13120444536 its reverse (63544402131), we get a palindrome (76664846667).

The spelling of 13120444536 in words is "thirteen billion, one hundred twenty million, four hundred forty-four thousand, five hundred thirty-six".