665200171 has 4 divisors (see below), whose sum is σ = 683178592. Its totient is φ = 647221752.

The previous prime is 665200141. The next prime is 665200189. The reversal of 665200171 is 171002566.

665200171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665200171 - 2¹¹ = 665198123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665200111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8989155 + ... + 8989228.

It is an arithmetic number, because the mean of its divisors is an integer number (170794648).

Almost surely, 2^665200171 is an apocalyptic number.

665200171 is a deficient number, since it is larger than the sum of its proper divisors (17978421).

665200171 is a wasteful number, since it uses less digits than its factorization.

665200171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17978420.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 665200171 is about 25791.4747736534. The cubic root of 665200171 is about 872.9394434958.

The spelling of 665200171 in words is "six hundred sixty-five million, two hundred thousand, one hundred seventy-one".