16216564408 has 64 divisors (see below), whose sum is σ = 33523269120. Its totient is φ = 7293062400.

The previous prime is 16216564379. The next prime is 16216564417. The reversal of 16216564408 is 80446561261.

It is a super-2 number, since 2×16216564408² (a number of 21 digits) contains 22 as substring.

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, 4228860 + ... + 4232692.

It is an arithmetic number, because the mean of its divisors is an integer number (523801080).

Almost surely, 2^16216564408 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 16216564408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16761634560).

16216564408 is an abundant number, since it is smaller than the sum of its proper divisors (17306704712).

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

16216564408 is a wasteful number, since it uses less digits than its factorization.

16216564408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348 (or 4344 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 16216564408 in words is "sixteen billion, two hundred sixteen million, five hundred sixty-four thousand, four hundred eight".