12540626448643 has 4 divisors (see below), whose sum is σ = 12945162785728. Its totient is φ = 12136090111560.

The previous prime is 12540626448599. The next prime is 12540626448737. The reversal of 12540626448643 is 34684462604521.

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

It is a cyclic number.

It is not a de Polignac number, because 12540626448643 - 2¹³ = 12540626440451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12540626443643) 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, 202268168496 + ... + 202268168557.

It is an arithmetic number, because the mean of its divisors is an integer number (3236290696432).

Almost surely, 2^{12540626448643} is an apocalyptic number.

12540626448643 is a deficient number, since it is larger than the sum of its proper divisors (404536337085).

12540626448643 is an equidigital number, since it uses as much as digits as its factorization.

12540626448643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404536337084.

The product of its (nonzero) digits is 26542080, while the sum is 55.

The spelling of 12540626448643 in words is "twelve trillion, five hundred forty billion, six hundred twenty-six million, four hundred forty-eight thousand, six hundred forty-three".