13161261312438 has 8 divisors (see below), whose sum is σ = 26322522624888. Its totient is φ = 4387087104144.

The previous prime is 13161261312413. The next prime is 13161261312439. The reversal of 13161261312438 is 83421316216131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

13161261312438 is an admirable number.

It is a super-3 number, since 3×13161261312438³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13161261312438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13161261312439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096771776031 + ... + 1096771776042.

It is an arithmetic number, because the mean of its divisors is an integer number (3290315328111).

Almost surely, 2^{13161261312438} is an apocalyptic number.

13161261312438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13161261312438 is a wasteful number, since it uses less digits than its factorization.

13161261312438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193543552078.

The product of its digits is 124416, while the sum is 42.

Adding to 13161261312438 its reverse (83421316216131), we get a palindrome (96582577528569).

The spelling of 13161261312438 in words is "thirteen trillion, one hundred sixty-one billion, two hundred sixty-one million, three hundred twelve thousand, four hundred thirty-eight".