243723661541 has 12 divisors (see below), whose sum is σ = 260454055008. Its totient is φ = 228013355712.

The previous prime is 243723661529. The next prime is 243723661567. The reversal of 243723661541 is 145166327342.

It is a de Polignac number, because none of the positive numbers 2^k-243723661541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243723661492 and 243723661501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243723661501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2476691 + ... + 2573216.

It is an arithmetic number, because the mean of its divisors is an integer number (21704504584).

Almost surely, 2^243723661541 is an apocalyptic number.

It is an amenable number.

243723661541 is a deficient number, since it is larger than the sum of its proper divisors (16730393467).

243723661541 is a wasteful number, since it uses less digits than its factorization.

243723661541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050108 (or 5050091 counting only the distinct ones).

The product of its digits is 725760, while the sum is 44.

Adding to 243723661541 its reverse (145166327342), we get a palindrome (388889988883).

The spelling of 243723661541 in words is "two hundred forty-three billion, seven hundred twenty-three million, six hundred sixty-one thousand, five hundred forty-one".