225665751 has 4 divisors (see below), whose sum is σ = 300887672. Its totient is φ = 150443832.

The previous prime is 225665749. The next prime is 225665767. The reversal of 225665751 is 157566522.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 225665751 - 2¹ = 225665749 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 (225665651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37610956 + ... + 37610961.

It is an arithmetic number, because the mean of its divisors is an integer number (75221918).

Almost surely, 2^225665751 is an apocalyptic number.

225665751 is a deficient number, since it is larger than the sum of its proper divisors (75221921).

225665751 is an equidigital number, since it uses as much as digits as its factorization.

225665751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75221920.

The product of its digits is 126000, while the sum is 39.

The square root of 225665751 is about 15022.1753085231. The cubic root of 225665751 is about 608.8194950928.

The spelling of 225665751 in words is "two hundred twenty-five million, six hundred sixty-five thousand, seven hundred fifty-one".