218551081424 has 80 divisors (see below), whose sum is σ = 480661735680. Its totient is φ = 95432256000.

The previous prime is 218551081409. The next prime is 218551081433. The reversal of 218551081424 is 424180155812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2931134 + ... + 3004770.

It is an arithmetic number, because the mean of its divisors is an integer number (6008271696).

Almost surely, 2^218551081424 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 218551081424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240330867840).

218551081424 is an abundant number, since it is smaller than the sum of its proper divisors (262110654256).

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

218551081424 is a wasteful number, since it uses less digits than its factorization.

218551081424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74428 (or 74422 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 41.

The spelling of 218551081424 in words is "two hundred eighteen billion, five hundred fifty-one million, eighty-one thousand, four hundred twenty-four".