18127865689 has 2 divisors, whose sum is σ = 18127865690. Its totient is φ = 18127865688.

The previous prime is 18127865683. The next prime is 18127865711. The reversal of 18127865689 is 98656872181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17021638089 + 1106227600 = 130467^2 + 33260^2 .

It is a cyclic number.

It is not a de Polignac number, because 18127865689 - 2¹¹ = 18127863641 is a prime.

It is a super-3 number, since 3×18127865689³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18127865683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9063932844 + 9063932845.

It is an arithmetic number, because the mean of its divisors is an integer number (9063932845).

Almost surely, 2^18127865689 is an apocalyptic number.

It is an amenable number.

18127865689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18127865689 is an equidigital number, since it uses as much as digits as its factorization.

18127865689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 61.

The spelling of 18127865689 in words is "eighteen billion, one hundred twenty-seven million, eight hundred sixty-five thousand, six hundred eighty-nine".