18385517093 has 2 divisors, whose sum is σ = 18385517094. Its totient is φ = 18385517092.

The previous prime is 18385516997. The next prime is 18385517177. The reversal of 18385517093 is 39071558381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16806011044 + 1579506049 = 129638^2 + 39743^2 .

It is a cyclic number.

It is not a de Polignac number, because 18385517093 - 2¹⁰ = 18385516069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18385547093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192758546 + 9192758547.

It is an arithmetic number, because the mean of its divisors is an integer number (9192758547).

Almost surely, 2^18385517093 is an apocalyptic number.

It is an amenable number.

18385517093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385517093 is an equidigital number, since it uses as much as digits as its factorization.

18385517093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 18385517093 in words is "eighteen billion, three hundred eighty-five million, five hundred seventeen thousand, ninety-three".