665159 has 8 divisors (see below), whose sum is σ = 768528. Its totient is φ = 568960.

The previous prime is 665153. The next prime is 665177. The reversal of 665159 is 951566.

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

It is a cyclic number.

It is not a de Polignac number, because 665159 - 2¹⁶ = 599623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665153) 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, 1592 + ... + 1965.

It is an arithmetic number, because the mean of its divisors is an integer number (96066).

2⁶⁶⁵¹⁵⁹ is an apocalyptic number.

665159 is a deficient number, since it is larger than the sum of its proper divisors (103369).

665159 is a wasteful number, since it uses less digits than its factorization.

665159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585.

The product of its digits is 8100, while the sum is 32.

The square root of 665159 is about 815.5728048433. The cubic root of 665159 is about 87.2921433613.

It can be divided in two parts, 66 and 5159, that added together give a palindrome (5225).

The spelling of 665159 in words is "six hundred sixty-five thousand, one hundred fifty-nine".