225478661 has 4 divisors (see below), whose sum is σ = 225700524. Its totient is φ = 225256800.

The previous prime is 225478657. The next prime is 225478663. The reversal of 225478661 is 166874522.

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 59197636 + 166281025 = 7694^2 + 12895^2 .

It is a cyclic number.

It is not a de Polignac number, because 225478661 - 2² = 225478657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225478663) 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, 109400 + ... + 111441.

It is an arithmetic number, because the mean of its divisors is an integer number (56425131).

Almost surely, 2^225478661 is an apocalyptic number.

It is an amenable number.

225478661 is a deficient number, since it is larger than the sum of its proper divisors (221863).

225478661 is a wasteful number, since it uses less digits than its factorization.

225478661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221862.

The product of its digits is 161280, while the sum is 41.

The square root of 225478661 is about 15015.9468898901. The cubic root of 225478661 is about 608.6511996809.

The spelling of 225478661 in words is "two hundred twenty-five million, four hundred seventy-eight thousand, six hundred sixty-one".