161180177872 has 80 divisors (see below), whose sum is σ = 369527241600. Its totient is φ = 66637186560.

The previous prime is 161180177869. The next prime is 161180177881. The reversal of 161180177872 is 278771081161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3814879 + ... + 3856897.

It is an arithmetic number, because the mean of its divisors is an integer number (4619090520).

Almost surely, 2^161180177872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161180177872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184763620800).

161180177872 is an abundant number, since it is smaller than the sum of its proper divisors (208347063728).

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

161180177872 is a wasteful number, since it uses less digits than its factorization.

161180177872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43244 (or 43238 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 49.

The spelling of 161180177872 in words is "one hundred sixty-one billion, one hundred eighty million, one hundred seventy-seven thousand, eight hundred seventy-two".