13521503645 has 8 divisors (see below), whose sum is σ = 17473943256. Its totient is φ = 9985110336.

The previous prime is 13521503627. The next prime is 13521503669. The reversal of 13521503645 is 54630512531.

It can be written as a sum of positive squares in 4 ways, for example, as 121 + 13521503524 = 11^2 + 116282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13521503645 - 2⁶ = 13521503581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104011502 + ... + 104011631.

It is an arithmetic number, because the mean of its divisors is an integer number (2184242907).

Almost surely, 2^13521503645 is an apocalyptic number.

It is an amenable number.

13521503645 is a deficient number, since it is larger than the sum of its proper divisors (3952439611).

13521503645 is a wasteful number, since it uses less digits than its factorization.

13521503645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208023151.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 13521503645 in words is "thirteen billion, five hundred twenty-one million, five hundred three thousand, six hundred forty-five".