12521643653 has 2 divisors, whose sum is σ = 12521643654. Its totient is φ = 12521643652.

The previous prime is 12521643643. The next prime is 12521643679. The reversal of 12521643653 is 35634612521.

12521643653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10119957604 + 2401686049 = 100598^2 + 49007^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521643653 - 2¹⁶ = 12521578117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12521643643) 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 as a sum of consecutive naturals, namely, 6260821826 + 6260821827.

It is an arithmetic number, because the mean of its divisors is an integer number (6260821827).

Almost surely, 2^12521643653 is an apocalyptic number.

It is an amenable number.

12521643653 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521643653 is an equidigital number, since it uses as much as digits as its factorization.

12521643653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The spelling of 12521643653 in words is "twelve billion, five hundred twenty-one million, six hundred forty-three thousand, six hundred fifty-three".