12800737447681 has 4 divisors (see below), whose sum is σ = 12800749871700. Its totient is φ = 12800725023664.

The previous prime is 12800737447661. The next prime is 12800737447711. The reversal of 12800737447681 is 18674473700821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4167477273600 + 8633260174081 = 2041440^2 + 2938241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12800737447681 is a prime.

It is a super-2 number, since 2×12800737447681² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12800737447651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4511326 + ... + 6778903.

It is an arithmetic number, because the mean of its divisors is an integer number (3200187467925).

Almost surely, 2^{12800737447681} is an apocalyptic number.

It is an amenable number.

12800737447681 is a deficient number, since it is larger than the sum of its proper divisors (12424019).

12800737447681 is a wasteful number, since it uses less digits than its factorization.

12800737447681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12424018.

The product of its (nonzero) digits is 12644352, while the sum is 58.

The spelling of 12800737447681 in words is "twelve trillion, eight hundred billion, seven hundred thirty-seven million, four hundred forty-seven thousand, six hundred eighty-one".