225663985 has 4 divisors (see below), whose sum is σ = 270796788. Its totient is φ = 180531184.

The previous prime is 225663979. The next prime is 225664003. The reversal of 225663985 is 589366522.

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 154952704 + 70711281 = 12448^2 + 8409^2 .

It is a cyclic number.

It is not a de Polignac number, because 225663985 - 2⁷ = 225663857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22566394 + ... + 22566403.

It is an arithmetic number, because the mean of its divisors is an integer number (67699197).

Almost surely, 2^225663985 is an apocalyptic number.

It is an amenable number.

225663985 is a deficient number, since it is larger than the sum of its proper divisors (45132803).

225663985 is an equidigital number, since it uses as much as digits as its factorization.

225663985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45132802.

The product of its digits is 777600, while the sum is 46.

The square root of 225663985 is about 15022.1165286387. The cubic root of 225663985 is about 608.8179069356.

The spelling of 225663985 in words is "two hundred twenty-five million, six hundred sixty-three thousand, nine hundred eighty-five".