665072211 has 16 divisors (see below), whose sum is σ = 894483968. Its totient is φ = 439538400.

The previous prime is 665072207. The next prime is 665072227. The reversal of 665072211 is 112270566.

It is not a de Polignac number, because 665072211 - 2² = 665072207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665072251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169605 + ... + 173481.

It is an arithmetic number, because the mean of its divisors is an integer number (55905248).

Almost surely, 2^665072211 is an apocalyptic number.

665072211 is a deficient number, since it is larger than the sum of its proper divisors (229411757).

665072211 is a wasteful number, since it uses less digits than its factorization.

665072211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 665072211 is about 25788.9939896848. The cubic root of 665072211 is about 872.8834661128.

The spelling of 665072211 in words is "six hundred sixty-five million, seventy-two thousand, two hundred eleven".