225485661 has 16 divisors (see below), whose sum is σ = 312596480. Its totient is φ = 144419760.

The previous prime is 225485653. The next prime is 225485693. The reversal of 225485661 is 166584522.

It is not a de Polignac number, because 225485661 - 2³ = 225485653 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225485651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4206 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (19537280).

Almost surely, 2^225485661 is an apocalyptic number.

It is an amenable number.

225485661 is a deficient number, since it is larger than the sum of its proper divisors (87110819).

225485661 is a wasteful number, since it uses less digits than its factorization.

225485661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17616.

The product of its digits is 115200, while the sum is 39.

The square root of 225485661 is about 15016.1799736151. The cubic root of 225485661 is about 608.6574981547.

The spelling of 225485661 in words is "two hundred twenty-five million, four hundred eighty-five thousand, six hundred sixty-one".