16818354877824 has 512 divisors, whose sum is σ = 52250738688000. Its totient is φ = 5318631106560.

The previous prime is 16818354877789. The next prime is 16818354877837. The reversal of 16818354877824 is 42877845381861.

16818354877824 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 8 + 3 + 548 + 7 + 78 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2420948719 + ... + 2420955665.

It is an arithmetic number, because the mean of its divisors is an integer number (102052224000).

Almost surely, 2^{16818354877824} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16818354877824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26125369344000).

16818354877824 is an abundant number, since it is smaller than the sum of its proper divisors (35432383810176).

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

16818354877824 is a wasteful number, since it uses less digits than its factorization.

16818354877824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7443 (or 7425 counting only the distinct ones).

The product of its digits is 578027520, while the sum is 72.

The spelling of 16818354877824 in words is "sixteen trillion, eight hundred eighteen billion, three hundred fifty-four million, eight hundred seventy-seven thousand, eight hundred twenty-four".