18883566109 has 2 divisors, whose sum is σ = 18883566110. Its totient is φ = 18883566108.

The previous prime is 18883566089. The next prime is 18883566131. The reversal of 18883566109 is 90166538881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15416947225 + 3466618884 = 124165^2 + 58878^2 .

It is an emirp because it is prime and its reverse (90166538881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18883566109 - 2²⁹ = 18346695197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18883566109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18883566139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9441783054 + 9441783055.

It is an arithmetic number, because the mean of its divisors is an integer number (9441783055).

Almost surely, 2^18883566109 is an apocalyptic number.

It is an amenable number.

18883566109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18883566109 is an equidigital number, since it uses as much as digits as its factorization.

18883566109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 18883566109 in words is "eighteen billion, eight hundred eighty-three million, five hundred sixty-six thousand, one hundred nine".