12255523622521 has 3 divisors (see below), whose sum is σ = 12255527123311. Its totient is φ = 12255520121732.

The previous prime is 12255523622491. The next prime is 12255523622527. The reversal of 12255523622521 is 12522632555221.

The square root of 12255523622521 is 3500789.

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

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.

It can be written as a sum of positive squares in only one way, i.e., 112668306921 + 12142855315600 = 335661^2 + 3484660^2 .

It is not a de Polignac number, because 12255523622521 - 2¹³ = 12255523614329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12255523622527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1750395 + ... + 5251183.

Almost surely, 2^{12255523622521} is an apocalyptic number.

12255523622521 is the 3500789-th square number.

12255523622521 is the 1750395-th centered octagonal number.

It is an amenable number.

12255523622521 is a deficient number, since it is larger than the sum of its proper divisors (3500790).

12255523622521 is an frugal number, since it uses more digits than its factorization.

12255523622521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001578 (or 3500789 counting only the distinct ones).

The product of its digits is 720000, while the sum is 43.

The spelling of 12255523622521 in words is "twelve trillion, two hundred fifty-five billion, five hundred twenty-three million, six hundred twenty-two thousand, five hundred twenty-one".