665328506271 has 64 divisors (see below), whose sum is σ = 1072241103360. Its totient is φ = 361632522240.

The previous prime is 665328506267. The next prime is 665328506317. The reversal of 665328506271 is 172605823566.

It is not a de Polignac number, because 665328506271 - 2² = 665328506267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665328506221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1939695 + ... + 2256783.

It is an arithmetic number, because the mean of its divisors is an integer number (16753767240).

Almost surely, 2^665328506271 is an apocalyptic number.

665328506271 is a deficient number, since it is larger than the sum of its proper divisors (406912597089).

665328506271 is a wasteful number, since it uses less digits than its factorization.

665328506271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317256.

The product of its (nonzero) digits is 3628800, while the sum is 51.

The spelling of 665328506271 in words is "six hundred sixty-five billion, three hundred twenty-eight million, five hundred six thousand, two hundred seventy-one".