665061213 has 8 divisors (see below), whose sum is σ = 887039776. Its totient is φ = 443228400.

The previous prime is 665061181. The next prime is 665061247. The reversal of 665061213 is 312160566.

665061213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665061213 - 2⁵ = 665061181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665061283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25303 + ... + 44388.

It is an arithmetic number, because the mean of its divisors is an integer number (110879972).

Almost surely, 2^665061213 is an apocalyptic number.

It is an amenable number.

665061213 is a deficient number, since it is larger than the sum of its proper divisors (221978563).

665061213 is a wasteful number, since it uses less digits than its factorization.

665061213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72875.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 665061213 is about 25788.7807583065. The cubic root of 665061213 is about 872.8786545925.

The spelling of 665061213 in words is "six hundred sixty-five million, sixty-one thousand, two hundred thirteen".