665872227 has 6 divisors (see below), whose sum is σ = 961815452. Its totient is φ = 443914812.

The previous prime is 665872213. The next prime is 665872261. The reversal of 665872227 is 722278566.

665872227 is a `hidden beast` number, since 66 + 587 + 2 + 2 + 2 + 7 = 666.

It is not a de Polignac number, because 665872227 - 2⁴ = 665872211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665872927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36992893 + ... + 36992910.

Almost surely, 2^665872227 is an apocalyptic number.

665872227 is a deficient number, since it is larger than the sum of its proper divisors (295943225).

665872227 is a wasteful number, since it uses less digits than its factorization.

665872227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73985809 (or 73985806 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 665872227 is about 25804.5001307911. The cubic root of 665872227 is about 873.2333233217.

The spelling of 665872227 in words is "six hundred sixty-five million, eight hundred seventy-two thousand, two hundred twenty-seven".