161161551110112 has 192 divisors, whose sum is σ = 485797054901760. Its totient is φ = 45826357929984.

The previous prime is 161161551110071. The next prime is 161161551110117. The reversal of 161161551110112 is 211011155161161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161161551110117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143766439 + ... + 144883097.

It is an arithmetic number, because the mean of its divisors is an integer number (2530192994280).

Almost surely, 2^{161161551110112} is an apocalyptic number.

161161551110112 is a gapful number since it is divisible by the number (12) 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 161161551110112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242898527450880).

161161551110112 is an abundant number, since it is smaller than the sum of its proper divisors (324635503791648).

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

161161551110112 is a wasteful number, since it uses less digits than its factorization.

161161551110112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117705 (or 1117697 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 33.

The spelling of 161161551110112 in words is "one hundred sixty-one trillion, one hundred sixty-one billion, five hundred fifty-one million, one hundred ten thousand, one hundred twelve".