665133943 has 4 divisors (see below), whose sum is σ = 673553440. Its totient is φ = 656714448.

The previous prime is 665133929. The next prime is 665134003. The reversal of 665133943 is 349331566.

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 665133943 - 2⁹ = 665133431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665133896 and 665133905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665133643) 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, 4209630 + ... + 4209787.

It is an arithmetic number, because the mean of its divisors is an integer number (168388360).

Almost surely, 2^665133943 is an apocalyptic number.

665133943 is a deficient number, since it is larger than the sum of its proper divisors (8419497).

665133943 is an equidigital number, since it uses as much as digits as its factorization.

665133943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8419496.

The product of its digits is 174960, while the sum is 40.

The square root of 665133943 is about 25790.1908290730. The cubic root of 665133943 is about 872.9104722905.

The spelling of 665133943 in words is "six hundred sixty-five million, one hundred thirty-three thousand, nine hundred forty-three".