18039555173 has 2 divisors, whose sum is σ = 18039555174. Its totient is φ = 18039555172.

The previous prime is 18039555143. The next prime is 18039555197. The reversal of 18039555173 is 37155593081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11552380324 + 6487174849 = 107482^2 + 80543^2 .

It is a cyclic number.

It is not a de Polignac number, because 18039555173 - 2¹⁰ = 18039554149 is a prime.

It is a super-2 number, since 2×18039555173² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18039555103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019777586 + 9019777587.

It is an arithmetic number, because the mean of its divisors is an integer number (9019777587).

Almost surely, 2^18039555173 is an apocalyptic number.

It is an amenable number.

18039555173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039555173 is an equidigital number, since it uses as much as digits as its factorization.

18039555173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 18039555173 in words is "eighteen billion, thirty-nine million, five hundred fifty-five thousand, one hundred seventy-three".