665143 has 4 divisors (see below), whose sum is σ = 681408. Its totient is φ = 648880.

The previous prime is 665141. The next prime is 665153. The reversal of 665143 is 341566.

665143 is nontrivially palindromic in base 15.

665143 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 665143 - 2¹ = 665141 is a prime.

It is a Duffinian number.

665143 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665141) 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, 8071 + ... + 8152.

It is an arithmetic number, because the mean of its divisors is an integer number (170352).

2⁶⁶⁵¹⁴³ is an apocalyptic number.

665143 is a deficient number, since it is larger than the sum of its proper divisors (16265).

665143 is a wasteful number, since it uses less digits than its factorization.

665143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16264.

The product of its digits is 2160, while the sum is 25.

The square root of 665143 is about 815.5629957275. The cubic root of 665143 is about 87.2914434357.

It can be divided in two parts, 665 and 143, that added together give a palindrome (808).

The spelling of 665143 in words is "six hundred sixty-five thousand, one hundred forty-three".