18516834144 has 48 divisors (see below), whose sum is σ = 54007435440. Its totient is φ = 6172277760.

The previous prime is 18516834143. The next prime is 18516834187. The reversal of 18516834144 is 44143861581.

18516834144 is a `hidden beast` number, since 18 + 516 + 83 + 4 + 1 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18516834144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516834143) 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 in 7 ways as a sum of consecutive naturals, for example, 10714897 + ... + 10716624.

It is an arithmetic number, because the mean of its divisors is an integer number (1125154905).

Almost surely, 2^18516834144 is an apocalyptic number.

It is an amenable number.

18516834144 is an abundant number, since it is smaller than the sum of its proper divisors (35490601296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18516834144 is a wasteful number, since it uses less digits than its factorization.

18516834144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21431540 (or 21431526 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The spelling of 18516834144 in words is "eighteen billion, five hundred sixteen million, eight hundred thirty-four thousand, one hundred forty-four".