665860227 has 4 divisors (see below), whose sum is σ = 887813640. Its totient is φ = 443906816.

The previous prime is 665860207. The next prime is 665860231. The reversal of 665860227 is 722068566.

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

It is a cyclic number.

It is not a de Polignac number, because 665860227 - 2⁶ = 665860163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665860207) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 110976702 + ... + 110976707.

It is an arithmetic number, because the mean of its divisors is an integer number (221953410).

Almost surely, 2^665860227 is an apocalyptic number.

665860227 is a deficient number, since it is larger than the sum of its proper divisors (221953413).

665860227 is a wasteful number, since it uses less digits than its factorization.

665860227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221953412.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 665860227 is about 25804.2676121606. The cubic root of 665860227 is about 873.2280776392.

The spelling of 665860227 in words is "six hundred sixty-five million, eight hundred sixty thousand, two hundred twenty-seven".