216989879616 has 448 divisors, whose sum is σ = 700292874240. Its totient is φ = 65670359040.

The previous prime is 216989879551. The next prime is 216989879629. The reversal of 216989879616 is 616978989612.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65297731 + ... + 65301053.

Almost surely, 2^216989879616 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 216989879616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350146437120).

216989879616 is an abundant number, since it is smaller than the sum of its proper divisors (483302994624).

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

216989879616 is a wasteful number, since it uses less digits than its factorization.

216989879616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451 (or 3435 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 72.

The spelling of 216989879616 in words is "two hundred sixteen billion, nine hundred eighty-nine million, eight hundred seventy-nine thousand, six hundred sixteen".