13129387505 has 32 divisors (see below), whose sum is σ = 18636791040. Its totient is φ = 8785877760.

The previous prime is 13129387457. The next prime is 13129387549. The reversal of 13129387505 is 50578392131.

13129387505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13129387505 - 2¹⁰ = 13129386481 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202706 + ... + 259515.

It is an arithmetic number, because the mean of its divisors is an integer number (582399720).

Almost surely, 2^13129387505 is an apocalyptic number.

It is an amenable number.

13129387505 is a deficient number, since it is larger than the sum of its proper divisors (5507403535).

13129387505 is a wasteful number, since it uses less digits than its factorization.

13129387505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462281.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 13129387505 in words is "thirteen billion, one hundred twenty-nine million, three hundred eighty-seven thousand, five hundred five".