18549473443 has 2 divisors, whose sum is σ = 18549473444. Its totient is φ = 18549473442.

The previous prime is 18549473407. The next prime is 18549473473. The reversal of 18549473443 is 34437494581.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18549473443 - 2¹³ = 18549465251 is a prime.

It is not a weakly prime, because it can be changed into another prime (18549473473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9274736721 + 9274736722.

It is an arithmetic number, because the mean of its divisors is an integer number (9274736722).

Almost surely, 2^18549473443 is an apocalyptic number.

18549473443 is a deficient number, since it is larger than the sum of its proper divisors (1).

18549473443 is an equidigital number, since it uses as much as digits as its factorization.

18549473443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 52.

The spelling of 18549473443 in words is "eighteen billion, five hundred forty-nine million, four hundred seventy-three thousand, four hundred forty-three".