216918858912 has 576 divisors, whose sum is σ = 713520783360. Its totient is φ = 57364070400.

The previous prime is 216918858901. The next prime is 216918858967. The reversal of 216918858912 is 219858819612.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1135700737 + ... + 1135700927.

It is an arithmetic number, because the mean of its divisors is an integer number (1238751360).

Almost surely, 2^216918858912 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 216918858912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356760391680).

216918858912 is an abundant number, since it is smaller than the sum of its proper divisors (496601924448).

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

216918858912 is a wasteful number, since it uses less digits than its factorization.

216918858912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 450 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 60.

The spelling of 216918858912 in words is "two hundred sixteen billion, nine hundred eighteen million, eight hundred fifty-eight thousand, nine hundred twelve".