18884705117 has 2 divisors, whose sum is σ = 18884705118. Its totient is φ = 18884705116.

The previous prime is 18884705113. The next prime is 18884705137. The reversal of 18884705117 is 71150748881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15921644761 + 2963060356 = 126181^2 + 54434^2 .

It is a cyclic number.

It is not a de Polignac number, because 18884705117 - 2² = 18884705113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18884705111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442352558 + 9442352559.

It is an arithmetic number, because the mean of its divisors is an integer number (9442352559).

Almost surely, 2^18884705117 is an apocalyptic number.

It is an amenable number.

18884705117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18884705117 is an equidigital number, since it uses as much as digits as its factorization.

18884705117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 501760, while the sum is 50.

The spelling of 18884705117 in words is "eighteen billion, eight hundred eighty-four million, seven hundred five thousand, one hundred seventeen".