665611265 has 8 divisors (see below), whose sum is σ = 871345728. Its totient is φ = 484080880.

The previous prime is 665611253. The next prime is 665611301. The reversal of 665611265 is 562116566.

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

It is not a de Polignac number, because 665611265 - 2⁶ = 665611201 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6050957 + ... + 6051066.

It is an arithmetic number, because the mean of its divisors is an integer number (108918216).

Almost surely, 2^665611265 is an apocalyptic number.

It is an amenable number.

665611265 is a deficient number, since it is larger than the sum of its proper divisors (205734463).

665611265 is a wasteful number, since it uses less digits than its factorization.

665611265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12102039.

The product of its digits is 64800, while the sum is 38.

The square root of 665611265 is about 25799.4431141449. The cubic root of 665611265 is about 873.1192321185.

The spelling of 665611265 in words is "six hundred sixty-five million, six hundred eleven thousand, two hundred sixty-five".