16163521616 has 80 divisors (see below), whose sum is σ = 36040550400. Its totient is φ = 6945148800.

The previous prime is 16163521603. The next prime is 16163521631. The reversal of 16163521616 is 61612536161.

It is a super-2 number, since 2×16163521616² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 16163521616.

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, 1596731 + ... + 1606821.

It is an arithmetic number, because the mean of its divisors is an integer number (450506880).

Almost surely, 2^16163521616 is an apocalyptic number.

16163521616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16163521616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18020275200).

16163521616 is an abundant number, since it is smaller than the sum of its proper divisors (19877028784).

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

16163521616 is a wasteful number, since it uses less digits than its factorization.

16163521616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608 (or 10602 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The spelling of 16163521616 in words is "sixteen billion, one hundred sixty-three million, five hundred twenty-one thousand, six hundred sixteen".