665321223 has 8 divisors (see below), whose sum is σ = 1013822848. Its totient is φ = 380183544.

The previous prime is 665321221. The next prime is 665321263. The reversal of 665321223 is 322123566.

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

It is not a de Polignac number, because 665321223 - 2¹ = 665321221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665321221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15840961 + ... + 15841002.

It is an arithmetic number, because the mean of its divisors is an integer number (126727856).

Almost surely, 2^665321223 is an apocalyptic number.

665321223 is a deficient number, since it is larger than the sum of its proper divisors (348501625).

665321223 is a wasteful number, since it uses less digits than its factorization.

665321223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31681973.

The product of its digits is 12960, while the sum is 30.

The square root of 665321223 is about 25793.8214113380. The cubic root of 665321223 is about 872.9923922977.

Adding to 665321223 its reverse (322123566), we get a palindrome (987444789).

The spelling of 665321223 in words is "six hundred sixty-five million, three hundred twenty-one thousand, two hundred twenty-three".