665223243 has 8 divisors (see below), whose sum is σ = 939138768. Its totient is φ = 417394944.

The previous prime is 665223217. The next prime is 665223263. The reversal of 665223243 is 342322566.

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

It is not a de Polignac number, because 665223243 - 2⁶ = 665223179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665223263) by changing a digit.

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, 6521746 + ... + 6521847.

It is an arithmetic number, because the mean of its divisors is an integer number (117392346).

Almost surely, 2^665223243 is an apocalyptic number.

665223243 is a deficient number, since it is larger than the sum of its proper divisors (273915525).

665223243 is a wasteful number, since it uses less digits than its factorization.

665223243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13043613.

The product of its digits is 51840, while the sum is 33.

The square root of 665223243 is about 25791.9220493549. The cubic root of 665223243 is about 872.9495358093.

The spelling of 665223243 in words is "six hundred sixty-five million, two hundred twenty-three thousand, two hundred forty-three".