161105616 has 120 divisors (see below), whose sum is σ = 537763200. Its totient is φ = 44022528.

The previous prime is 161105591. The next prime is 161105627. The reversal of 161105616 is 616501161.

It is a self number, because there is not a number n which added to its sum of digits gives 161105616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19710 + ... + 26658.

It is an arithmetic number, because the mean of its divisors is an integer number (4481360).

Almost surely, 2^161105616 is an apocalyptic number.

161105616 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 161105616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268881600).

161105616 is an abundant number, since it is smaller than the sum of its proper divisors (376657584).

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

161105616 is a wasteful number, since it uses less digits than its factorization.

161105616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6993 (or 6984 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161105616 is about 12692.7387115626. The cubic root of 161105616 is about 544.1311138695.

Adding to 161105616 its reverse (616501161), we get a palindrome (777606777).

The spelling of 161105616 in words is "one hundred sixty-one million, one hundred five thousand, six hundred sixteen".