18585939109 has 2 divisors, whose sum is σ = 18585939110. Its totient is φ = 18585939108.

The previous prime is 18585939059. The next prime is 18585939143. The reversal of 18585939109 is 90193958581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14901084900 + 3684854209 = 122070^2 + 60703^2 .

It is a cyclic number.

It is not a de Polignac number, because 18585939109 - 2⁷ = 18585938981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18585939209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9292969554 + 9292969555.

It is an arithmetic number, because the mean of its divisors is an integer number (9292969555).

Almost surely, 2^18585939109 is an apocalyptic number.

It is an amenable number.

18585939109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18585939109 is an equidigital number, since it uses as much as digits as its factorization.

18585939109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3499200, while the sum is 58.

The spelling of 18585939109 in words is "eighteen billion, five hundred eighty-five million, nine hundred thirty-nine thousand, one hundred nine".