12647761388441 has 4 divisors (see below), whose sum is σ = 12740080814772. Its totient is φ = 12555441962112.

The previous prime is 12647761388413. The next prime is 12647761388447. The reversal of 12647761388441 is 14488316774621.

It is a happy number.

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 2506268934400 + 10141492454041 = 1583120^2 + 3184571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12647761388441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12647761388447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46159712960 + ... + 46159713233.

It is an arithmetic number, because the mean of its divisors is an integer number (3185020203693).

Almost surely, 2^{12647761388441} is an apocalyptic number.

It is an amenable number.

12647761388441 is a deficient number, since it is larger than the sum of its proper divisors (92319426331).

12647761388441 is an equidigital number, since it uses as much as digits as its factorization.

12647761388441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92319426330.

The product of its digits is 43352064, while the sum is 62.

The spelling of 12647761388441 in words is "twelve trillion, six hundred forty-seven billion, seven hundred sixty-one million, three hundred eighty-eight thousand, four hundred forty-one".