18549473473 has 2 divisors, whose sum is σ = 18549473474. Its totient is φ = 18549473472.

The previous prime is 18549473443. The next prime is 18549473489. The reversal of 18549473473 is 37437494581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10057482369 + 8491991104 = 100287^2 + 92152^2 .

It is a cyclic number.

It is not a de Polignac number, because 18549473473 - 2¹³ = 18549465281 is a prime.

It is a super-2 number, since 2×18549473473² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18549473443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274736736 + 9274736737.

It is an arithmetic number, because the mean of its divisors is an integer number (9274736737).

Almost surely, 2^18549473473 is an apocalyptic number.

It is an amenable number.

18549473473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18549473473 is an equidigital number, since it uses as much as digits as its factorization.

18549473473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 55.

The spelling of 18549473473 in words is "eighteen billion, five hundred forty-nine million, four hundred seventy-three thousand, four hundred seventy-three".