243040404555 has 64 divisors (see below), whose sum is σ = 467395461120. Its totient is φ = 119113918848.

The previous prime is 243040404521. The next prime is 243040404587. The reversal of 243040404555 is 555404040342.

243040404555 is a `hidden beast` number, since 24 + 3 + 0 + 40 + 40 + 4 + 555 = 666.

It is not a de Polignac number, because 243040404555 - 2¹⁰ = 243040403531 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 63 ways as a sum of consecutive naturals, for example, 80862 + ... + 701868.

It is an arithmetic number, because the mean of its divisors is an integer number (7303054080).

Almost surely, 2^243040404555 is an apocalyptic number.

243040404555 is a deficient number, since it is larger than the sum of its proper divisors (224355056565).

243040404555 is a wasteful number, since it uses less digits than its factorization.

243040404555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621257 (or 621251 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 36.

Adding to 243040404555 its reverse (555404040342), we get a palindrome (798444444897).

The spelling of 243040404555 in words is "two hundred forty-three billion, forty million, four hundred four thousand, five hundred fifty-five".