18898515017 has 2 divisors, whose sum is σ = 18898515018. Its totient is φ = 18898515016.

The previous prime is 18898514959. The next prime is 18898515023. The reversal of 18898515017 is 71051589881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12493874176 + 6404640841 = 111776^2 + 80029^2 .

It is an emirp because it is prime and its reverse (71051589881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18898515017 - 2²² = 18894320713 is a prime.

It is a super-3 number, since 3×18898515017³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18898515017.

It is not a weakly prime, because it can be changed into another prime (18898515037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449257508 + 9449257509.

It is an arithmetic number, because the mean of its divisors is an integer number (9449257509).

Almost surely, 2^18898515017 is an apocalyptic number.

It is an amenable number.

18898515017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18898515017 is an equidigital number, since it uses as much as digits as its factorization.

18898515017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 53.

The spelling of 18898515017 in words is "eighteen billion, eight hundred ninety-eight million, five hundred fifteen thousand, seventeen".