12539129856 has 104 divisors (see below), whose sum is σ = 36473409024. Its totient is φ = 3799695360.

The previous prime is 12539129849. The next prime is 12539129879. The reversal of 12539129856 is 65892193521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12539129799 and 12539129808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88785 + ... + 181551.

It is an arithmetic number, because the mean of its divisors is an integer number (350705856).

Almost surely, 2^12539129856 is an apocalyptic number.

12539129856 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 12539129856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18236704512).

12539129856 is an abundant number, since it is smaller than the sum of its proper divisors (23934279168).

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

12539129856 is an equidigital number, since it uses as much as digits as its factorization.

12539129856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92805 (or 92783 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 51.

The spelling of 12539129856 in words is "twelve billion, five hundred thirty-nine million, one hundred twenty-nine thousand, eight hundred fifty-six".