12643603525 has 18 divisors (see below), whose sum is σ = 18237754770. Its totient is φ = 8669898720.

The previous prime is 12643603499. The next prime is 12643603571. The reversal of 12643603525 is 52530634621.

It can be written as a sum of positive squares in 3 ways, for example, as 3731865921 + 8911737604 = 61089^2 + 94402^2 .

It is not a de Polignac number, because 12643603525 - 2¹⁵ = 12643570757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5159430 + ... + 5161879.

Almost surely, 2^12643603525 is an apocalyptic number.

It is an amenable number.

12643603525 is a deficient number, since it is larger than the sum of its proper divisors (5594151245).

12643603525 is a wasteful number, since it uses less digits than its factorization.

12643603525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321333 (or 10321321 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 12643603525 in words is "twelve billion, six hundred forty-three million, six hundred three thousand, five hundred twenty-five".