12563519845 has 4 divisors (see below), whose sum is σ = 15076223820. Its totient is φ = 10050815872.

The previous prime is 12563519789. The next prime is 12563519849. The reversal of 12563519845 is 54891536521.

12563519845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3667634721 + 8895885124 = 60561^2 + 94318^2 .

It is a cyclic number.

It is not a de Polignac number, because 12563519845 - 2¹⁵ = 12563487077 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12563519849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256351980 + ... + 1256351989.

It is an arithmetic number, because the mean of its divisors is an integer number (3769055955).

Almost surely, 2^12563519845 is an apocalyptic number.

It is an amenable number.

12563519845 is a deficient number, since it is larger than the sum of its proper divisors (2512703975).

12563519845 is an equidigital number, since it uses as much as digits as its factorization.

12563519845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512703974.

The product of its digits is 1296000, while the sum is 49.

The spelling of 12563519845 in words is "twelve billion, five hundred sixty-three million, five hundred nineteen thousand, eight hundred forty-five".