665227265 has 8 divisors (see below), whose sum is σ = 811359528. Its totient is φ = 523457280.

The previous prime is 665227253. The next prime is 665227267. The reversal of 665227265 is 562722566.

It is a happy number.

It is a Cunningham number, because it is equal to 25792²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 665227264 = 1^2 + 25792^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665227265 - 2⁴ = 665227249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665227267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1090232 + ... + 1090841.

It is an arithmetic number, because the mean of its divisors is an integer number (101419941).

Almost surely, 2^665227265 is an apocalyptic number.

It is an amenable number.

665227265 is a deficient number, since it is larger than the sum of its proper divisors (146132263).

665227265 is a wasteful number, since it uses less digits than its factorization.

665227265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181139.

The product of its digits is 302400, while the sum is 41.

The square root of 665227265 is about 25792.0000193859. Note that the first 4 decimals coincide. The cubic root of 665227265 is about 872.9512951164.

The spelling of 665227265 in words is "six hundred sixty-five million, two hundred twenty-seven thousand, two hundred sixty-five".