18004391562673 has 2 divisors, whose sum is σ = 18004391562674. Its totient is φ = 18004391562672.

The previous prime is 18004391562617. The next prime is 18004391562709. The reversal of 18004391562673 is 37626519340081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17823654345249 + 180737217424 = 4221807^2 + 425132^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004391562673 - 2⁴¹ = 15805368307121 is a prime.

It is not a weakly prime, because it can be changed into another prime (18004398562673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9002195781336 + 9002195781337.

It is an arithmetic number, because the mean of its divisors is an integer number (9002195781337).

It is a 1-persistent number, because it is pandigital, but 2⋅18004391562673 = 36008783125346 is not.

Almost surely, 2^{18004391562673} is an apocalyptic number.

It is an amenable number.

18004391562673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18004391562673 is an equidigital number, since it uses as much as digits as its factorization.

18004391562673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 18004391562673 in words is "eighteen trillion, four billion, three hundred ninety-one million, five hundred sixty-two thousand, six hundred seventy-three".