161304331665 has 16 divisors (see below), whose sum is σ = 259068256128. Its totient is φ = 85701868416.

The previous prime is 161304331613. The next prime is 161304331681. The reversal of 161304331665 is 566133403161.

161304331665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161304331665 - 2¹³ = 161304323473 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 20440204 + ... + 20448093.

It is an arithmetic number, because the mean of its divisors is an integer number (16191766008).

Almost surely, 2^161304331665 is an apocalyptic number.

161304331665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161304331665 is a deficient number, since it is larger than the sum of its proper divisors (97763924463).

161304331665 is a wasteful number, since it uses less digits than its factorization.

161304331665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40888568.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 161304331665 in words is "one hundred sixty-one billion, three hundred four million, three hundred thirty-one thousand, six hundred sixty-five".