665241133 has 4 divisors (see below), whose sum is σ = 665396028. Its totient is φ = 665086240.

The previous prime is 665241079. The next prime is 665241163. The reversal of 665241133 is 331142566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 424277604 + 240963529 = 20598^2 + 15523^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665241133 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665241095 and 665241104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665241163) 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, 70816 + ... + 79657.

It is an arithmetic number, because the mean of its divisors is an integer number (166349007).

Almost surely, 2^665241133 is an apocalyptic number.

It is an amenable number.

665241133 is a deficient number, since it is larger than the sum of its proper divisors (154895).

665241133 is a wasteful number, since it uses less digits than its factorization.

665241133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154894.

The product of its digits is 12960, while the sum is 31.

The square root of 665241133 is about 25792.2688610366. The cubic root of 665241133 is about 872.9573612160.

Adding to 665241133 its reverse (331142566), we get a palindrome (996383699).

The spelling of 665241133 in words is "six hundred sixty-five million, two hundred forty-one thousand, one hundred thirty-three".