665072220211 has 8 divisors (see below), whose sum is σ = 761887962464. Its totient is φ = 568707834240.

The previous prime is 665072220203. The next prime is 665072220223. The reversal of 665072220211 is 112022270566.

665072220211 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 665072220211 - 2³ = 665072220203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665072224211) 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, 112835910 + ... + 112841803.

It is an arithmetic number, because the mean of its divisors is an integer number (95235995308).

Almost surely, 2^665072220211 is an apocalyptic number.

665072220211 is a deficient number, since it is larger than the sum of its proper divisors (96815742253).

665072220211 is a wasteful number, since it uses less digits than its factorization.

665072220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225678141.

The product of its (nonzero) digits is 20160, while the sum is 34.

Adding to 665072220211 its reverse (112022270566), we get a palindrome (777094490777).

The spelling of 665072220211 in words is "six hundred sixty-five billion, seventy-two million, two hundred twenty thousand, two hundred eleven".