12768284731681 has 4 divisors (see below), whose sum is σ = 12852842908864. Its totient is φ = 12683726554500.

The previous prime is 12768284731603. The next prime is 12768284731717. The reversal of 12768284731681 is 18613748286721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12768284731681 - 2¹⁵ = 12768284698913 is a prime.

It is a super-2 number, since 2×12768284731681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12768284731381) 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, 42279088365 + ... + 42279088666.

It is an arithmetic number, because the mean of its divisors is an integer number (3213210727216).

Almost surely, 2^{12768284731681} is an apocalyptic number.

It is an amenable number.

12768284731681 is a deficient number, since it is larger than the sum of its proper divisors (84558177183).

12768284731681 is an equidigital number, since it uses as much as digits as its factorization.

12768284731681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84558177182.

The product of its digits is 43352064, while the sum is 64.

The spelling of 12768284731681 in words is "twelve trillion, seven hundred sixty-eight billion, two hundred eighty-four million, seven hundred thirty-one thousand, six hundred eighty-one".