666110605165 has 16 divisors (see below), whose sum is σ = 805705555968. Its totient is φ = 528640753536.

The previous prime is 666110605123. The next prime is 666110605169. The reversal of 666110605165 is 561506011666.

It is a cyclic number.

It is not a de Polignac number, because 666110605165 - 2⁷ = 666110605037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666110605169) 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, 7258809 + ... + 7350001.

It is an arithmetic number, because the mean of its divisors is an integer number (50356597248).

Almost surely, 2^666110605165 is an apocalyptic number.

It is an amenable number.

666110605165 is a deficient number, since it is larger than the sum of its proper divisors (139594950803).

666110605165 is a wasteful number, since it uses less digits than its factorization.

666110605165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102828.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 666110605165 in words is "six hundred sixty-six billion, one hundred ten million, six hundred five thousand, one hundred sixty-five".