12718784648641 has 4 divisors (see below), whose sum is σ = 12720208455252. Its totient is φ = 12717360842032.

The previous prime is 12718784648639. The next prime is 12718784648729. The reversal of 12718784648641 is 14684648781721.

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 2005633769616 + 10713150879025 = 1416204^2 + 3273095^2 .

It is a cyclic number.

It is not a de Polignac number, because 12718784648641 - 2¹ = 12718784648639 is a prime.

It is a super-4 number, since 4×12718784648641⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12718784648611) 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, 711889906 + ... + 711907771.

It is an arithmetic number, because the mean of its divisors is an integer number (3180052113813).

Almost surely, 2^{12718784648641} is an apocalyptic number.

It is an amenable number.

12718784648641 is a deficient number, since it is larger than the sum of its proper divisors (1423806611).

12718784648641 is an equidigital number, since it uses as much as digits as its factorization.

12718784648641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423806610.

The product of its digits is 115605504, while the sum is 67.

The spelling of 12718784648641 in words is "twelve trillion, seven hundred eighteen billion, seven hundred eighty-four million, six hundred forty-eight thousand, six hundred forty-one".