12865289018 has 8 divisors (see below), whose sum is σ = 19819499412. Its totient is φ = 6258789216.

The previous prime is 12865289011. The next prime is 12865289081. The reversal of 12865289018 is 81098256821.

It can be written as a sum of positive squares in 2 ways, for example, as 12406172689 + 459116329 = 111383^2 + 21427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12865289011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86927555 + ... + 86927702.

Almost surely, 2^12865289018 is an apocalyptic number.

12865289018 is a deficient number, since it is larger than the sum of its proper divisors (6954210394).

12865289018 is a wasteful number, since it uses less digits than its factorization.

12865289018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173855296.

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 12865289018 in words is "twelve billion, eight hundred sixty-five million, two hundred eighty-nine thousand, eighteen".