665223245 has 8 divisors (see below), whose sum is σ = 801755160. Its totient is φ = 529853760.

The previous prime is 665223217. The next prime is 665223263. The reversal of 665223245 is 542322566.

It can be written as a sum of positive squares in 4 ways, for example, as 396886084 + 268337161 = 19922^2 + 16381^2 .

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

It is not a de Polignac number, because 665223245 - 2²⁰ = 664174669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289346 + ... + 291635.

It is an arithmetic number, because the mean of its divisors is an integer number (100219395).

Almost surely, 2^665223245 is an apocalyptic number.

It is an amenable number.

665223245 is a deficient number, since it is larger than the sum of its proper divisors (136531915).

665223245 is a wasteful number, since it uses less digits than its factorization.

665223245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581215.

The product of its digits is 86400, while the sum is 35.

The square root of 665223245 is about 25791.9220881267. The cubic root of 665223245 is about 872.9495366842.

The spelling of 665223245 in words is "six hundred sixty-five million, two hundred twenty-three thousand, two hundred forty-five".