13865331138 has 32 divisors (see below), whose sum is σ = 29636311104. Its totient is φ = 4309251072.

The previous prime is 13865331133. The next prime is 13865331191. The reversal of 13865331138 is 83113356831.

It is a self number, because there is not a number n which added to its sum of digits gives 13865331138.

It is not an unprimeable number, because it can be changed into a prime (13865331131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624295 + ... + 646122.

It is an arithmetic number, because the mean of its divisors is an integer number (926134722).

Almost surely, 2^13865331138 is an apocalyptic number.

13865331138 is an abundant number, since it is smaller than the sum of its proper divisors (15770979966).

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

13865331138 is a wasteful number, since it uses less digits than its factorization.

13865331138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270546.

The product of its digits is 155520, while the sum is 42.

Adding to 13865331138 its reverse (83113356831), we get a palindrome (96978687969).

The spelling of 13865331138 in words is "thirteen billion, eight hundred sixty-five million, three hundred thirty-one thousand, one hundred thirty-eight".