665233513 has 4 divisors (see below), whose sum is σ = 760266880. Its totient is φ = 570200148.

The previous prime is 665233507. The next prime is 665233559. The reversal of 665233513 is 315332566.

665233513 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665233513 - 2²⁹ = 128362601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665233573) 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, 47516673 + ... + 47516686.

It is an arithmetic number, because the mean of its divisors is an integer number (190066720).

Almost surely, 2^665233513 is an apocalyptic number.

It is an amenable number.

665233513 is a deficient number, since it is larger than the sum of its proper divisors (95033367).

665233513 is an equidigital number, since it uses as much as digits as its factorization.

665233513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95033366.

The product of its digits is 48600, while the sum is 34.

The square root of 665233513 is about 25792.1211419301. The cubic root of 665233513 is about 872.9540281086.

The spelling of 665233513 in words is "six hundred sixty-five million, two hundred thirty-three thousand, five hundred thirteen".