18208840093 has 2 divisors, whose sum is σ = 18208840094. Its totient is φ = 18208840092.

The previous prime is 18208840079. The next prime is 18208840121. The reversal of 18208840093 is 39004880281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17178558489 + 1030281604 = 131067^2 + 32098^2 .

It is a cyclic number.

It is not a de Polignac number, because 18208840093 - 2⁹ = 18208839581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18208840003) 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, 9104420046 + 9104420047.

It is an arithmetic number, because the mean of its divisors is an integer number (9104420047).

Almost surely, 2^18208840093 is an apocalyptic number.

It is an amenable number.

18208840093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18208840093 is an equidigital number, since it uses as much as digits as its factorization.

18208840093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 18208840093 in words is "eighteen billion, two hundred eight million, eight hundred forty thousand, ninety-three".