665621112206 has 16 divisors (see below), whose sum is σ = 1007829164160. Its totient is φ = 329678467320.

The previous prime is 665621112203. The next prime is 665621112209. The reversal of 665621112206 is 602211126566.

665621112206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665621112203) and next prime (665621112209).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 665621112206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665621112203) 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, 3440921 + ... + 3629211.

It is an arithmetic number, because the mean of its divisors is an integer number (62989322760).

Almost surely, 2^665621112206 is an apocalyptic number.

665621112206 is a deficient number, since it is larger than the sum of its proper divisors (342208051954).

665621112206 is a wasteful number, since it uses less digits than its factorization.

665621112206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204919.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 665621112206 in words is "six hundred sixty-five billion, six hundred twenty-one million, one hundred twelve thousand, two hundred six".