216799491216 has 640 divisors, whose sum is σ = 755334512640. Its totient is φ = 51867648000.

The previous prime is 216799491179. The next prime is 216799491221. The reversal of 216799491216 is 612194997612.

It is a happy number.

It is a super-2 number, since 2×216799491216² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 805945930 + ... + 805946198.

It is an arithmetic number, because the mean of its divisors is an integer number (1180210176).

Almost surely, 2^216799491216 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 216799491216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (377667256320).

216799491216 is an abundant number, since it is smaller than the sum of its proper divisors (538535021424).

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

216799491216 is a wasteful number, since it uses less digits than its factorization.

216799491216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 537 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 57.

The spelling of 216799491216 in words is "two hundred sixteen billion, seven hundred ninety-nine million, four hundred ninety-one thousand, two hundred sixteen".