225240065 has 4 divisors (see below), whose sum is σ = 270288084. Its totient is φ = 180192048.

The previous prime is 225240061. The next prime is 225240073. The reversal of 225240065 is 560042522.

It is a Cunningham number, because it is equal to 15008²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81072016 + 144168049 = 9004^2 + 12007^2 .

It is a cyclic number.

It is not a de Polignac number, because 225240065 - 2² = 225240061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225240061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22524002 + ... + 22524011.

It is an arithmetic number, because the mean of its divisors is an integer number (67572021).

Almost surely, 2^225240065 is an apocalyptic number.

It is an amenable number.

225240065 is a deficient number, since it is larger than the sum of its proper divisors (45048019).

225240065 is an equidigital number, since it uses as much as digits as its factorization.

225240065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45048018.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 225240065 is about 15008.0000333156. Note that the first 4 decimals coincide. The cubic root of 225240065 is about 608.4364373105.

Adding to 225240065 its reverse (560042522), we get a palindrome (785282587).

The spelling of 225240065 in words is "two hundred twenty-five million, two hundred forty thousand, sixty-five".