243158320065 has 16 divisors (see below), whose sum is σ = 389454008256. Its totient is φ = 129550872000.

The previous prime is 243158320063. The next prime is 243158320121. The reversal of 243158320065 is 560023851342.

It is a happy number.

243158320065 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 243158320065 - 2¹ = 243158320063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243158320063) by changing a digit.

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, 8332786 + ... + 8361915.

It is an arithmetic number, because the mean of its divisors is an integer number (24340875516).

Almost surely, 2^243158320065 is an apocalyptic number.

It is an amenable number.

243158320065 is a deficient number, since it is larger than the sum of its proper divisors (146295688191).

243158320065 is a wasteful number, since it uses less digits than its factorization.

243158320065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16695680.

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 243158320065 in words is "two hundred forty-three billion, one hundred fifty-eight million, three hundred twenty thousand, sixty-five".