665211133 has 4 divisors (see below), whose sum is σ = 665406688. Its totient is φ = 665015580.

The previous prime is 665211121. The next prime is 665211143. The reversal of 665211133 is 331112566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331112566 = 2 ⋅165556283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665211133 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 (665211103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92583 + ... + 99508.

It is an arithmetic number, because the mean of its divisors is an integer number (166351672).

Almost surely, 2^665211133 is an apocalyptic number.

It is an amenable number.

665211133 is a deficient number, since it is larger than the sum of its proper divisors (195555).

665211133 is a wasteful number, since it uses less digits than its factorization.

665211133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195554.

The product of its digits is 3240, while the sum is 28.

The square root of 665211133 is about 25791.6872848598. The cubic root of 665211133 is about 872.9442385986.

Adding to 665211133 its reverse (331112566), we get a palindrome (996323699).

The spelling of 665211133 in words is "six hundred sixty-five million, two hundred eleven thousand, one hundred thirty-three".