665445227 has 4 divisors (see below), whose sum is σ = 700468680. Its totient is φ = 630421776.

The previous prime is 665445197. The next prime is 665445241. The reversal of 665445227 is 722544566.

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 665445227 - 2¹⁴ = 665428843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665445827) 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, 17511698 + ... + 17511735.

It is an arithmetic number, because the mean of its divisors is an integer number (175117170).

Almost surely, 2^665445227 is an apocalyptic number.

665445227 is a deficient number, since it is larger than the sum of its proper divisors (35023453).

665445227 is a wasteful number, since it uses less digits than its factorization.

665445227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35023452.

The product of its digits is 403200, while the sum is 41.

The square root of 665445227 is about 25796.2250532903. The cubic root of 665445227 is about 873.0466256615.

The spelling of 665445227 in words is "six hundred sixty-five million, four hundred forty-five thousand, two hundred twenty-seven".