138805255513 has 4 divisors (see below), whose sum is σ = 138813484288. Its totient is φ = 138797026740.

The previous prime is 138805255489. The next prime is 138805255549. The reversal of 138805255513 is 315552508831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138805255513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138805255583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4089033 + ... + 4122838.

It is an arithmetic number, because the mean of its divisors is an integer number (34703371072).

Almost surely, 2^138805255513 is an apocalyptic number.

It is an amenable number.

138805255513 is a deficient number, since it is larger than the sum of its proper divisors (8228775).

138805255513 is an equidigital number, since it uses as much as digits as its factorization.

138805255513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8228774.

The product of its (nonzero) digits is 720000, while the sum is 46.

The spelling of 138805255513 in words is "one hundred thirty-eight billion, eight hundred five million, two hundred fifty-five thousand, five hundred thirteen".