665382239 has 4 divisors (see below), whose sum is σ = 665749056. Its totient is φ = 665015424.

The previous prime is 665382229. The next prime is 665382247. The reversal of 665382239 is 932283566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932283566 = 2 ⋅466141783.

It is a cyclic number.

It is not a de Polignac number, because 665382239 - 2¹⁶ = 665316703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665382239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665382209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180674 + ... + 184319.

It is an arithmetic number, because the mean of its divisors is an integer number (166437264).

Almost surely, 2^665382239 is an apocalyptic number.

665382239 is a deficient number, since it is larger than the sum of its proper divisors (366817).

665382239 is a wasteful number, since it uses less digits than its factorization.

665382239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366816.

The product of its digits is 466560, while the sum is 44.

The square root of 665382239 is about 25795.0041480904. The cubic root of 665382239 is about 873.0190785929.

The spelling of 665382239 in words is "six hundred sixty-five million, three hundred eighty-two thousand, two hundred thirty-nine".