216909786912 has 192 divisors, whose sum is σ = 710387354880. Its totient is φ = 56423153664.

The previous prime is 216909786829. The next prime is 216909786979. The reversal of 216909786912 is 219687909612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 467664 + ... + 807792.

It is an arithmetic number, because the mean of its divisors is an integer number (3699934140).

Almost surely, 2^216909786912 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 216909786912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355193677440).

216909786912 is an abundant number, since it is smaller than the sum of its proper divisors (493477567968).

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

216909786912 is a wasteful number, since it uses less digits than its factorization.

216909786912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340235 (or 340227 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 60.

The spelling of 216909786912 in words is "two hundred sixteen billion, nine hundred nine million, seven hundred eighty-six thousand, nine hundred twelve".