243145220305 has 16 divisors (see below), whose sum is σ = 314234968320. Its totient is φ = 179543947968.

The previous prime is 243145220299. The next prime is 243145220327. The reversal of 243145220305 is 503022541342.

It is a cyclic number.

It is not a de Polignac number, because 243145220305 - 2²⁵ = 243111665873 is a prime.

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, 1298004 + ... + 1473466.

It is an arithmetic number, because the mean of its divisors is an integer number (19639685520).

Almost surely, 2^243145220305 is an apocalyptic number.

It is an amenable number.

243145220305 is a deficient number, since it is larger than the sum of its proper divisors (71089748015).

243145220305 is a wasteful number, since it uses less digits than its factorization.

243145220305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196800.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 243145220305 its reverse (503022541342), we get a palindrome (746167761647).

The spelling of 243145220305 in words is "two hundred forty-three billion, one hundred forty-five million, two hundred twenty thousand, three hundred five".