13520052405 has 48 divisors (see below), whose sum is σ = 23790954096. Its totient is φ = 7101849600.

The previous prime is 13520052397. The next prime is 13520052407. The reversal of 13520052405 is 50425002531.

It is a happy number.

13520052405 is a `hidden beast` number, since 1 + 3 + 5 + 200 + 52 + 405 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1128355281 + 12391697124 = 33591^2 + 111318^2 .

It is not a de Polignac number, because 13520052405 - 2³ = 13520052397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520052407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 869479 + ... + 884891.

It is an arithmetic number, because the mean of its divisors is an integer number (495644877).

Almost surely, 2^13520052405 is an apocalyptic number.

13520052405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13520052405 is a deficient number, since it is larger than the sum of its proper divisors (10270901691).

13520052405 is a wasteful number, since it uses less digits than its factorization.

13520052405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15718 (or 15715 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 13520052405 its reverse (50425002531), we get a palindrome (63945054936).

The spelling of 13520052405 in words is "thirteen billion, five hundred twenty million, fifty-two thousand, four hundred five".