13139212816 has 80 divisors (see below), whose sum is σ = 26760006000. Its totient is φ = 6241536000.

The previous prime is 13139212813. The next prime is 13139212843. The reversal of 13139212816 is 61821293131.

It can be written as a sum of positive squares in 8 ways, for example, as 179667216 + 12959545600 = 13404^2 + 113840^2 .

It is not an unprimeable number, because it can be changed into a prime (13139212813) 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, 8481610 + ... + 8483158.

It is an arithmetic number, because the mean of its divisors is an integer number (334500075).

Almost surely, 2^13139212816 is an apocalyptic number.

13139212816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13139212816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13380003000).

13139212816 is an abundant number, since it is smaller than the sum of its proper divisors (13620793184).

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

13139212816 is a wasteful number, since it uses less digits than its factorization.

13139212816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868 (or 1862 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

It can be divided in two parts, 1313 and 9212816, that added together give a palindrome (9214129).

The spelling of 13139212816 in words is "thirteen billion, one hundred thirty-nine million, two hundred twelve thousand, eight hundred sixteen".