666066165611 has 64 divisors (see below), whose sum is σ = 888774405120. Its totient is φ = 483210240000.

The previous prime is 666066165593. The next prime is 666066165613. The reversal of 666066165611 is 116561660666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 666066165611 - 2¹⁰ = 666066164587 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 666066165611.

It is not an unprimeable number, because it can be changed into a prime (666066165613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 255294275 + ... + 255296883.

It is an arithmetic number, because the mean of its divisors is an integer number (13887100080).

Almost surely, 2^666066165611 is an apocalyptic number.

666066165611 is a deficient number, since it is larger than the sum of its proper divisors (222708239509).

666066165611 is a wasteful number, since it uses less digits than its factorization.

666066165611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4676.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 666066165611 in words is "six hundred sixty-six billion, sixty-six million, one hundred sixty-five thousand, six hundred eleven".