13013243215505 has 48 divisors (see below), whose sum is σ = 17102177760240. Its totient is φ = 9500717850624.

The previous prime is 13013243215499. The next prime is 13013243215543. The reversal of 13013243215505 is 50551234231031.

It is a happy number.

It can be written as a sum of positive squares in 24 ways, for example, as 11605904681536 + 1407338533969 = 3406744^2 + 1186313^2 .

It is not a de Polignac number, because 13013243215505 - 2²⁰ = 13013242166929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37735901 + ... + 38079189.

It is an arithmetic number, because the mean of its divisors is an integer number (356295370005).

Almost surely, 2^{13013243215505} is an apocalyptic number.

It is an amenable number.

13013243215505 is a deficient number, since it is larger than the sum of its proper divisors (4088934544735).

13013243215505 is a wasteful number, since it uses less digits than its factorization.

13013243215505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343830 (or 343817 counting only the distinct ones).

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

Adding to 13013243215505 its reverse (50551234231031), we get a palindrome (63564477446536).

The spelling of 13013243215505 in words is "thirteen trillion, thirteen billion, two hundred forty-three million, two hundred fifteen thousand, five hundred five".