665334223 has 2 divisors, whose sum is σ = 665334224. Its totient is φ = 665334222.

The previous prime is 665334217. The next prime is 665334233. The reversal of 665334223 is 322433566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665334223 - 2²⁵ = 631779791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665334233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332667111 + 332667112.

It is an arithmetic number, because the mean of its divisors is an integer number (332667112).

Almost surely, 2^665334223 is an apocalyptic number.

665334223 is a deficient number, since it is larger than the sum of its proper divisors (1).

665334223 is an equidigital number, since it uses as much as digits as its factorization.

665334223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 34.

The square root of 665334223 is about 25794.0734084402. The cubic root of 665334223 is about 872.9980781864.

Adding to 665334223 its reverse (322433566), we get a palindrome (987767789).

It can be divided in two parts, 66533 and 4223, that added together give a square (70756 = 266²).

The spelling of 665334223 in words is "six hundred sixty-five million, three hundred thirty-four thousand, two hundred twenty-three".