13129387506 has 12 divisors (see below), whose sum is σ = 28447006302. Its totient is φ = 4376462496.

The previous prime is 13129387457. The next prime is 13129387549. The reversal of 13129387506 is 60578392131.

13129387506 is a `hidden beast` number, since 13 + 129 + 3 + 8 + 7 + 506 = 666.

13129387506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8325650025 + 4803737481 = 91245^2 + 69309^2 .

It is a super-5 number, since 5×13129387506⁵ (a number of 52 digits) contains 55555 as substring.

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 5 ways as a sum of consecutive naturals, for example, 364705191 + ... + 364705226.

Almost surely, 2^13129387506 is an apocalyptic number.

13129387506 is an abundant number, since it is smaller than the sum of its proper divisors (15317618796).

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

13129387506 is a wasteful number, since it uses less digits than its factorization.

13129387506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729410425 (or 729410422 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 13129387506 in words is "thirteen billion, one hundred twenty-nine million, three hundred eighty-seven thousand, five hundred six".