161768330365 has 4 divisors (see below), whose sum is σ = 194121996444. Its totient is φ = 129414664288.

The previous prime is 161768330359. The next prime is 161768330389. The reversal of 161768330365 is 563033867161.

161768330365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71752729689 + 90015600676 = 267867^2 + 300026^2 .

It is a cyclic number.

It is not a de Polignac number, because 161768330365 - 2³ = 161768330357 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16176833032 + ... + 16176833041.

It is an arithmetic number, because the mean of its divisors is an integer number (48530499111).

Almost surely, 2^161768330365 is an apocalyptic number.

It is an amenable number.

161768330365 is a deficient number, since it is larger than the sum of its proper divisors (32353666079).

161768330365 is an equidigital number, since it uses as much as digits as its factorization.

161768330365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32353666078.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 161768330365 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, three hundred thirty thousand, three hundred sixty-five".