13438579885 has 4 divisors (see below), whose sum is σ = 16126295868. Its totient is φ = 10750863904.

The previous prime is 13438579871. The next prime is 13438579897. The reversal of 13438579885 is 58897583431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6829865449 + 6608714436 = 82643^2 + 81294^2 .

It is a cyclic number.

It is not a de Polignac number, because 13438579885 - 2¹⁵ = 13438547117 is a prime.

It is a super-2 number, since 2×13438579885² (a number of 21 digits) contains 22 as substring.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343857984 + ... + 1343857993.

It is an arithmetic number, because the mean of its divisors is an integer number (4031573967).

Almost surely, 2^13438579885 is an apocalyptic number.

It is an amenable number.

13438579885 is a deficient number, since it is larger than the sum of its proper divisors (2687715983).

13438579885 is an equidigital number, since it uses as much as digits as its factorization.

13438579885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687715982.

The product of its digits is 29030400, while the sum is 61.

The spelling of 13438579885 in words is "thirteen billion, four hundred thirty-eight million, five hundred seventy-nine thousand, eight hundred eighty-five".