18871434156384 has 96 divisors (see below), whose sum is σ = 55050690653280. Its totient is φ = 6289448601600.

The previous prime is 18871434156343. The next prime is 18871434156469. The reversal of 18871434156384 is 48365143417881.

18871434156384 is a `hidden beast` number, since 1 + 8 + 8 + 71 + 4 + 34 + 156 + 384 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18871434156384² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 3504364 + ... + 7072724.

It is an arithmetic number, because the mean of its divisors is an integer number (573444694305).

Almost surely, 2^{18871434156384} is an apocalyptic number.

It is an amenable number.

18871434156384 is an abundant number, since it is smaller than the sum of its proper divisors (36179256496896).

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

18871434156384 is a wasteful number, since it uses less digits than its factorization.

18871434156384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574501 (or 3574487 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 63.

The spelling of 18871434156384 in words is "eighteen trillion, eight hundred seventy-one billion, four hundred thirty-four million, one hundred fifty-six thousand, three hundred eighty-four".