225775437521 has 4 divisors (see below), whose sum is σ = 225778810944. Its totient is φ = 225772064100.

The previous prime is 225775437457. The next prime is 225775437539. The reversal of 225775437521 is 125734577522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225775437521 - 2⁶ = 225775437457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225775437521.

It is not an unprimeable number, because it can be changed into a prime (225775437571) 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 3 ways as a sum of consecutive naturals, for example, 1584245 + ... + 1720866.

It is an arithmetic number, because the mean of its divisors is an integer number (56444702736).

Almost surely, 2^225775437521 is an apocalyptic number.

It is an amenable number.

225775437521 is a deficient number, since it is larger than the sum of its proper divisors (3373423).

225775437521 is an equidigital number, since it uses as much as digits as its factorization.

225775437521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373422.

The product of its digits is 4116000, while the sum is 50.

The spelling of 225775437521 in words is "two hundred twenty-five billion, seven hundred seventy-five million, four hundred thirty-seven thousand, five hundred twenty-one".