665133 has 16 divisors (see below), whose sum is σ = 1067520. Its totient is φ = 359856.

The previous prime is 665131. The next prime is 665141. The reversal of 665133 is 331566.

It is not a de Polignac number, because 665133 - 2¹ = 665131 is a prime.

It is an Ulam number.

665133 is a lucky number.

It is a plaindrome in base 9 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435 + ... + 1232.

It is an arithmetic number, because the mean of its divisors is an integer number (66720).

2⁶⁶⁵¹³³ is an apocalyptic number.

It is an amenable number.

665133 is a deficient number, since it is larger than the sum of its proper divisors (402387).

665133 is a wasteful number, since it uses less digits than its factorization.

665133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its digits is 1620, while the sum is 24.

The square root of 665133 is about 815.5568649702. The cubic root of 665133 is about 87.2910059765.

Adding to 665133 its reverse (331566), we get a palindrome (996699).

The spelling of 665133 in words is "six hundred sixty-five thousand, one hundred thirty-three".