18009539554 has 4 divisors (see below), whose sum is σ = 27014309334. Its totient is φ = 9004769776.

The previous prime is 18009539503. The next prime is 18009539563. The reversal of 18009539554 is 45593590081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15041796025 + 2967743529 = 122645^2 + 54477^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18009539498 and 18009539507.

It is an unprimeable number.

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, 4502384887 + ... + 4502384890.

Almost surely, 2^18009539554 is an apocalyptic number.

18009539554 is a deficient number, since it is larger than the sum of its proper divisors (9004769780).

18009539554 is an equidigital number, since it uses as much as digits as its factorization.

18009539554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004769779.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 18009539554 in words is "eighteen billion, nine million, five hundred thirty-nine thousand, five hundred fifty-four".