666665163 has 12 divisors (see below), whose sum is σ = 985355800. Its totient is φ = 434107296.

The previous prime is 666665161. The next prime is 666665171. The reversal of 666665163 is 361566666.

666665163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666665163 - 2¹ = 666665161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666665161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 860938 + ... + 861711.

Almost surely, 2^666665163 is an apocalyptic number.

666665163 is a deficient number, since it is larger than the sum of its proper divisors (318690637).

666665163 is a wasteful number, since it uses less digits than its factorization.

666665163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722698 (or 1722695 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 666665163 is about 25819.8598563199. The cubic root of 666665163 is about 873.5798079489.

The spelling of 666665163 in words is "six hundred sixty-six million, six hundred sixty-five thousand, one hundred sixty-three".