666012289 has 6 divisors (see below), whose sum is σ = 689771030. Its totient is φ = 643045536.

The previous prime is 666012287. The next prime is 666012307. The reversal of 666012289 is 982210666.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 21715600 + 644296689 = 4660^2 + 25383^2 .

It is not a de Polignac number, because 666012289 - 2¹ = 666012287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666012283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395124 + ... + 396805.

Almost surely, 2^666012289 is an apocalyptic number.

It is an amenable number.

666012289 is a deficient number, since it is larger than the sum of its proper divisors (23758741).

666012289 is an equidigital number, since it uses as much as digits as its factorization.

666012289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791987 (or 791958 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 666012289 is about 25807.2138945683. The cubic root of 666012289 is about 873.2945453932.

The spelling of 666012289 in words is "six hundred sixty-six million, twelve thousand, two hundred eighty-nine".