18534413817 has 32 divisors (see below), whose sum is σ = 28679270400. Its totient is φ = 11807894736.

The previous prime is 18534413803. The next prime is 18534413819. The reversal of 18534413817 is 71831443581.

It is not a de Polignac number, because 18534413817 - 2¹⁵ = 18534381049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18534413819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671434 + ... + 698492.

It is an arithmetic number, because the mean of its divisors is an integer number (896227200).

Almost surely, 2^18534413817 is an apocalyptic number.

It is an amenable number.

18534413817 is a deficient number, since it is larger than the sum of its proper divisors (10144856583).

18534413817 is a wasteful number, since it uses less digits than its factorization.

18534413817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28194 (or 28188 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 18534413817 in words is "eighteen billion, five hundred thirty-four million, four hundred thirteen thousand, eight hundred seventeen".