12768744637781 has 4 divisors (see below), whose sum is σ = 13929539604864. Its totient is φ = 11607949670700.

The previous prime is 12768744637771. The next prime is 12768744637783. The reversal of 12768744637781 is 18773644786721.

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 12768744637781 - 2⁶ = 12768744637717 is a prime.

It is a super-2 number, since 2×12768744637781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12768744637783) 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, 580397483525 + ... + 580397483546.

It is an arithmetic number, because the mean of its divisors is an integer number (3482384901216).

Almost surely, 2^{12768744637781} is an apocalyptic number.

12768744637781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12768744637781 is a deficient number, since it is larger than the sum of its proper divisors (1160794967083).

12768744637781 is a wasteful number, since it uses less digits than its factorization.

12768744637781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160794967082.

The product of its digits is 531062784, while the sum is 71.

The spelling of 12768744637781 in words is "twelve trillion, seven hundred sixty-eight billion, seven hundred forty-four million, six hundred thirty-seven thousand, seven hundred eighty-one".