216403185384 has 192 divisors, whose sum is σ = 640741483200. Its totient is φ = 68236079616.

The previous prime is 216403185377. The next prime is 216403185389. The reversal of 216403185384 is 483581304612.

216403185384 is a `hidden beast` number, since 2 + 164 + 0 + 31 + 85 + 384 = 666.

It is not an unprimeable number, because it can be changed into a prime (216403185389) 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 47 ways as a sum of consecutive naturals, for example, 27070092 + ... + 27078084.

It is an arithmetic number, because the mean of its divisors is an integer number (3337195225).

Almost surely, 2^216403185384 is an apocalyptic number.

216403185384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216403185384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320370741600).

216403185384 is an abundant number, since it is smaller than the sum of its proper divisors (424338297816).

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

216403185384 is a wasteful number, since it uses less digits than its factorization.

216403185384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766 (or 8750 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

Adding to 216403185384 its reverse (483581304612), we get a palindrome (699984489996).

The spelling of 216403185384 in words is "two hundred sixteen billion, four hundred three million, one hundred eighty-five thousand, three hundred eighty-four".