243044020205 has 24 divisors (see below), whose sum is σ = 339708776472. Its totient is φ = 166443027072.

The previous prime is 243044020169. The next prime is 243044020237. The reversal of 243044020205 is 502020440342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5866084 + 243038154121 = 2422^2 + 492989^2 .

It is not a de Polignac number, because 243044020205 - 2¹⁴ = 243044003821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 452282 + ... + 831051.

It is an arithmetic number, because the mean of its divisors is an integer number (14154532353).

Almost surely, 2^243044020205 is an apocalyptic number.

It is an amenable number.

243044020205 is a deficient number, since it is larger than the sum of its proper divisors (96664756267).

243044020205 is a wasteful number, since it uses less digits than its factorization.

243044020205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284125 (or 1284118 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 243044020205 its reverse (502020440342), we get a palindrome (745064460547).

The spelling of 243044020205 in words is "two hundred forty-three billion, forty-four million, twenty thousand, two hundred five".