225256652521 has 2 divisors, whose sum is σ = 225256652522. Its totient is φ = 225256652520.

The previous prime is 225256652503. The next prime is 225256652557. The reversal of 225256652521 is 125256652522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185072040000 + 40184612521 = 430200^2 + 200461^2 .

It is a cyclic number.

It is not a de Polignac number, because 225256652521 - 2¹¹ = 225256650473 is a prime.

It is not a weakly prime, because it can be changed into another prime (225256652581) 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 as a sum of consecutive naturals, namely, 112628326260 + 112628326261.

It is an arithmetic number, because the mean of its divisors is an integer number (112628326261).

Almost surely, 2^225256652521 is an apocalyptic number.

It is an amenable number.

225256652521 is a deficient number, since it is larger than the sum of its proper divisors (1).

225256652521 is an equidigital number, since it uses as much as digits as its factorization.

225256652521 is an odious number, because the sum of its binary digits is odd.

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

Subtracting from 225256652521 its reverse (125256652522), we obtain a palindrome (99999999999).

The spelling of 225256652521 in words is "two hundred twenty-five billion, two hundred fifty-six million, six hundred fifty-two thousand, five hundred twenty-one".