161805165832832 has 32 divisors (see below), whose sum is σ = 323982504131220. Its totient is φ = 80491909894144.

The previous prime is 161805165832823. The next prime is 161805165832879. The reversal of 161805165832832 is 238238561508161.

161805165832832 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104330208494656 + 57474957338176 = 10214216^2 + 7581224^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3208357673 + ... + 3208408104.

Almost surely, 2^{161805165832832} is an apocalyptic number.

It is an amenable number.

161805165832832 is an abundant number, since it is smaller than the sum of its proper divisors (162177338298388).

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

161805165832832 is an equidigital number, since it uses as much as digits as its factorization.

161805165832832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416765988 (or 6416765976 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 59.

The spelling of 161805165832832 in words is "one hundred sixty-one trillion, eight hundred five billion, one hundred sixty-five million, eight hundred thirty-two thousand, eight hundred thirty-two".