161173906445280 has 192 divisors, whose sum is σ = 508124200550400. Its totient is φ = 42943619727360.

The previous prime is 161173906445207. The next prime is 161173906445297. The reversal of 161173906445280 is 82544609371161.

It is a self number, because there is not a number n which added to its sum of digits gives 161173906445280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9576006465 + ... + 9576023295.

It is an arithmetic number, because the mean of its divisors is an integer number (2646480211200).

It is a 2-persistent number, because it is pandigital, and so is 2⋅161173906445280 = 322347812890560, but 3⋅161173906445280 = 483521719335840 is not.

Almost surely, 2^{161173906445280} is an apocalyptic number.

161173906445280 is a gapful number since it is divisible by the number (10) 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 161173906445280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254062100275200).

161173906445280 is an abundant number, since it is smaller than the sum of its proper divisors (346950294105120).

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

161173906445280 is a wasteful number, since it uses less digits than its factorization.

161173906445280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32417 (or 32409 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 161173906445280 in words is "one hundred sixty-one trillion, one hundred seventy-three billion, nine hundred six million, four hundred forty-five thousand, two hundred eighty".