243580136505 has 16 divisors (see below), whose sum is σ = 392703246144. Its totient is φ = 128917730240.

The previous prime is 243580136497. The next prime is 243580136507. The reversal of 243580136505 is 505631085342.

243580136505 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 243580136505 - 2³ = 243580136497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243580136507) 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, 61977714 + ... + 61981643.

It is an arithmetic number, because the mean of its divisors is an integer number (24543952884).

Almost surely, 2^243580136505 is an apocalyptic number.

It is an amenable number.

243580136505 is a deficient number, since it is larger than the sum of its proper divisors (149123109639).

243580136505 is a wasteful number, since it uses less digits than its factorization.

243580136505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123959496.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 243580136505 in words is "two hundred forty-three billion, five hundred eighty million, one hundred thirty-six thousand, five hundred five".