225386661 has 4 divisors (see below), whose sum is σ = 300515552. Its totient is φ = 150257772.

The previous prime is 225386641. The next prime is 225386671. The reversal of 225386661 is 166683522.

225386661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 225386661 - 2⁹ = 225386149 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 (225386621) 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, 37564441 + ... + 37564446.

It is an arithmetic number, because the mean of its divisors is an integer number (75128888).

Almost surely, 2^225386661 is an apocalyptic number.

It is an amenable number.

225386661 is a deficient number, since it is larger than the sum of its proper divisors (75128891).

225386661 is an equidigital number, since it uses as much as digits as its factorization.

225386661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75128890.

The product of its digits is 103680, while the sum is 39.

The square root of 225386661 is about 15012.8831674665. The cubic root of 225386661 is about 608.5684076217.

The spelling of 225386661 in words is "two hundred twenty-five million, three hundred eighty-six thousand, six hundred sixty-one".