243505015161 has 4 divisors (see below), whose sum is σ = 324673353552. Its totient is φ = 162336676772.

The previous prime is 243505015139. The next prime is 243505015217. The reversal of 243505015161 is 161510505342.

243505015161 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243505015161 - 2²⁹ = 242968144249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243505019161) 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 3 ways as a sum of consecutive naturals, for example, 40584169191 + ... + 40584169196.

It is an arithmetic number, because the mean of its divisors is an integer number (81168338388).

Almost surely, 2^243505015161 is an apocalyptic number.

It is an amenable number.

243505015161 is a deficient number, since it is larger than the sum of its proper divisors (81168338391).

243505015161 is an equidigital number, since it uses as much as digits as its factorization.

243505015161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81168338390.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 243505015161 in words is "two hundred forty-three billion, five hundred five million, fifteen thousand, one hundred sixty-one".