225640465 has 8 divisors (see below), whose sum is σ = 282541248. Its totient is φ = 172663920.

The previous prime is 225640463. The next prime is 225640469. The reversal of 225640465 is 564046522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225640465 - 2¹ = 225640463 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 225640465.

It is not an unprimeable number, because it can be changed into a prime (225640463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980931 + ... + 981160.

It is an arithmetic number, because the mean of its divisors is an integer number (35317656).

Almost surely, 2^225640465 is an apocalyptic number.

It is an amenable number.

225640465 is a deficient number, since it is larger than the sum of its proper divisors (56900783).

225640465 is a wasteful number, since it uses less digits than its factorization.

225640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962119.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 225640465 is about 15021.3336624948. Note that the first 3 decimals coincide. The cubic root of 225640465 is about 608.7967546980.

Adding to 225640465 its reverse (564046522), we get a palindrome (789686987).

The spelling of 225640465 in words is "two hundred twenty-five million, six hundred forty thousand, four hundred sixty-five".