16513236225 has 36 divisors (see below), whose sum is σ = 29607109116. Its totient is φ = 8798106240.

The previous prime is 16513236211. The next prime is 16513236269. The reversal of 16513236225 is 52263231561.

16513236225 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 3 + 23 + 622 + 5 = 666.

16513236225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 112848129 + 16400388096 = 10623^2 + 128064^2 .

It is not a de Polignac number, because 16513236225 - 2¹⁵ = 16513203457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16513236225.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 187519 + ... + 261131.

Almost surely, 2^16513236225 is an apocalyptic number.

16513236225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16513236225 is a deficient number, since it is larger than the sum of its proper divisors (13093872891).

16513236225 is a wasteful number, since it uses less digits than its factorization.

16513236225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74626 (or 74618 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

Adding to 16513236225 its reverse (52263231561), we get a palindrome (68776467786).

The spelling of 16513236225 in words is "sixteen billion, five hundred thirteen million, two hundred thirty-six thousand, two hundred twenty-five".