12608819521 has 3 divisors (see below), whose sum is σ = 12608931811. Its totient is φ = 12608707232.

The previous prime is 12608819479. The next prime is 12608819537. The reversal of 12608819521 is 12591880621.

The square root of 12608819521 is 112289.

It is a perfect power (a square), and thus also a powerful number.

12608819521 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12591880621 = 19 ⋅662730559.

It can be written as a sum of positive squares in only one way, i.e., 12580089921 + 28729600 = 112161^2 + 5360^2 .

It is not a de Polignac number, because 12608819521 - 2⁹ = 12608819009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12608819021) 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 2 ways as a sum of consecutive naturals, for example, 56145 + ... + 168433.

Almost surely, 2^12608819521 is an apocalyptic number.

12608819521 is the 112289-th square number.

12608819521 is the 56145-th centered octagonal number.

It is an amenable number.

12608819521 is a deficient number, since it is larger than the sum of its proper divisors (112290).

12608819521 is an frugal number, since it uses more digits than its factorization.

12608819521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224578 (or 112289 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 12608819521 in words is "twelve billion, six hundred eight million, eight hundred nineteen thousand, five hundred twenty-one".