665765210271 has 8 divisors (see below), whose sum is σ = 1014499368064. Its totient is φ = 380437263000.

The previous prime is 665765210269. The next prime is 665765210359. The reversal of 665765210271 is 172012567566.

665765210271 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 665765210271 - 2¹ = 665765210269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665765210271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665765210251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15851552605 + ... + 15851552646.

It is an arithmetic number, because the mean of its divisors is an integer number (126812421008).

Almost surely, 2^665765210271 is an apocalyptic number.

665765210271 is a deficient number, since it is larger than the sum of its proper divisors (348734157793).

665765210271 is a wasteful number, since it uses less digits than its factorization.

665765210271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31703105261.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 665765210271 in words is "six hundred sixty-five billion, seven hundred sixty-five million, two hundred ten thousand, two hundred seventy-one".