12847247681 has 4 divisors (see below), whose sum is σ = 12851685252. Its totient is φ = 12842810112.

The previous prime is 12847247663. The next prime is 12847247713. The reversal of 12847247681 is 18674274821.

12847247681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18674274821 = 12917 ⋅1445713.

It can be written as a sum of positive squares in 2 ways, for example, as 2158996225 + 10688251456 = 46465^2 + 103384^2 .

It is a cyclic number.

It is not a de Polignac number, because 12847247681 - 2⁶ = 12847247617 is a prime.

It is a super-2 number, since 2×12847247681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12847247981) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2214440 + ... + 2220233.

It is an arithmetic number, because the mean of its divisors is an integer number (3212921313).

Almost surely, 2^12847247681 is an apocalyptic number.

It is an amenable number.

12847247681 is a deficient number, since it is larger than the sum of its proper divisors (4437571).

12847247681 is an equidigital number, since it uses as much as digits as its factorization.

12847247681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437570.

The product of its digits is 1204224, while the sum is 50.

The spelling of 12847247681 in words is "twelve billion, eight hundred forty-seven million, two hundred forty-seven thousand, six hundred eighty-one".