12781380544 has 56 divisors (see below), whose sum is σ = 25989095088. Its totient is φ = 6233364480.

The previous prime is 12781380463. The next prime is 12781380551. The reversal of 12781380544 is 44508318721.

12781380544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12781380544² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 12781380544.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2256564 + ... + 2262220.

Almost surely, 2^12781380544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12781380544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12994547544).

12781380544 is an abundant number, since it is smaller than the sum of its proper divisors (13207714544).

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

12781380544 is an equidigital number, since it uses as much as digits as its factorization.

12781380544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533 (or 6523 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 12781380544 in words is "twelve billion, seven hundred eighty-one million, three hundred eighty thousand, five hundred forty-four".