225646282646521 has 16 divisors (see below), whose sum is σ = 260746070872320. Its totient is φ = 192987438503680.

The previous prime is 225646282646483. The next prime is 225646282646527. The reversal of 225646282646521 is 125646282646522.

It is a cyclic number.

It is not a de Polignac number, because 225646282646521 - 2⁹ = 225646282646009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225646282646521.

It is not an unprimeable number, because it can be changed into a prime (225646282646527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246102406 + ... + 247017583.

It is an arithmetic number, because the mean of its divisors is an integer number (16296629429520).

Almost surely, 2^{225646282646521} is an apocalyptic number.

It is an amenable number.

225646282646521 is a deficient number, since it is larger than the sum of its proper divisors (35099788225799).

225646282646521 is a wasteful number, since it uses less digits than its factorization.

225646282646521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493122464.

The product of its digits is 132710400, while the sum is 61.

Subtracting from 225646282646521 its reverse (125646282646522), we obtain a palindrome (99999999999999).

The spelling of 225646282646521 in words is "two hundred twenty-five trillion, six hundred forty-six billion, two hundred eighty-two million, six hundred forty-six thousand, five hundred twenty-one".