665222 has 4 divisors (see below), whose sum is σ = 997836. Its totient is φ = 332610.

The previous prime is 665221. The next prime is 665233. The reversal of 665222 is 222566.

It is a happy number.

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

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166304 + ... + 166307.

It is an arithmetic number, because the mean of its divisors is an integer number (249459).

2⁶⁶⁵²²² is an apocalyptic number.

665222 is a deficient number, since it is larger than the sum of its proper divisors (332614).

665222 is a wasteful number, since it uses less digits than its factorization.

665222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332613.

The product of its digits is 1440, while the sum is 23.

The square root of 665222 is about 815.6114270901. The cubic root of 665222 is about 87.2948992094.

Adding to 665222 its reverse (222566), we get a palindrome (887788).

The spelling of 665222 in words is "six hundred sixty-five thousand, two hundred twenty-two".