161105111055600 has 120 divisors (see below), whose sum is σ = 516076589869680. Its totient is φ = 42961095106560.

The previous prime is 161105111055563. The next prime is 161105111055607. The reversal of 161105111055600 is 6550111501161.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161105111055607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259236442 + ... + 259857158.

It is an arithmetic number, because the mean of its divisors is an integer number (4300638248914).

Almost surely, 2^{161105111055600} is an apocalyptic number.

161105111055600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161105111055600 is an abundant number, since it is smaller than the sum of its proper divisors (354971478814080).

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

161105111055600 is a wasteful number, since it uses less digits than its factorization.

161105111055600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837027 (or 837016 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 33.

Adding to 161105111055600 its reverse (6550111501161), we get a palindrome (167655222556761).

The spelling of 161105111055600 in words is "one hundred sixty-one trillion, one hundred five billion, one hundred eleven million, fifty-five thousand, six hundred".