13287120525 has 180 divisors, whose sum is σ = 30318687828. Its totient is φ = 5716085760.

The previous prime is 13287120523. The next prime is 13287120541. The reversal of 13287120525 is 52502178231.

13287120525 is a `hidden beast` number, since 1 + 3 + 2 + 8 + 7 + 120 + 525 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 456121449 + 12830999076 = 21357^2 + 113274^2 .

It is not a de Polignac number, because 13287120525 - 2¹ = 13287120523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13287120525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13287120523) by changing a digit.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1682887 + ... + 1690763.

Almost surely, 2^13287120525 is an apocalyptic number.

13287120525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13287120525 is an abundant number, since it is smaller than the sum of its proper divisors (17031567303).

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

13287120525 is a wasteful number, since it uses less digits than its factorization.

13287120525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930 (or 7909 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

Adding to 13287120525 its reverse (52502178231), we get a palindrome (65789298756).

The spelling of 13287120525 in words is "thirteen billion, two hundred eighty-seven million, one hundred twenty thousand, five hundred twenty-five".