243540241553 has 16 divisors (see below), whose sum is σ = 280230212736. Its totient is φ = 207327396480.

The previous prime is 243540241547. The next prime is 243540241577. The reversal of 243540241553 is 355142045342.

It is a cyclic number.

It is not a de Polignac number, because 243540241553 - 2¹⁰ = 243540240529 is a prime.

It is a super-3 number, since 3×243540241553³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243540241583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1072325 + ... + 1279437.

It is an arithmetic number, because the mean of its divisors is an integer number (17514388296).

Almost surely, 2^243540241553 is an apocalyptic number.

It is an amenable number.

243540241553 is a deficient number, since it is larger than the sum of its proper divisors (36689971183).

243540241553 is a wasteful number, since it uses less digits than its factorization.

243540241553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208264.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 243540241553 its reverse (355142045342), we get a palindrome (598682286895).

The spelling of 243540241553 in words is "two hundred forty-three billion, five hundred forty million, two hundred forty-one thousand, five hundred fifty-three".