18573937553 has 2 divisors, whose sum is σ = 18573937554. Its totient is φ = 18573937552.

The previous prime is 18573937511. The next prime is 18573937601. The reversal of 18573937553 is 35573937581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12049013824 + 6524923729 = 109768^2 + 80777^2 .

It is a cyclic number.

It is not a de Polignac number, because 18573937553 - 2¹⁰ = 18573936529 is a prime.

It is not a weakly prime, because it can be changed into another prime (18573937453) 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, 9286968776 + 9286968777.

It is an arithmetic number, because the mean of its divisors is an integer number (9286968777).

Almost surely, 2^18573937553 is an apocalyptic number.

It is an amenable number.

18573937553 is a deficient number, since it is larger than the sum of its proper divisors (1).

18573937553 is an equidigital number, since it uses as much as digits as its factorization.

18573937553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11907000, while the sum is 56.

The spelling of 18573937553 in words is "eighteen billion, five hundred seventy-three million, nine hundred thirty-seven thousand, five hundred fifty-three".