243017404255553 has 4 divisors (see below), whose sum is σ = 243020207666820. Its totient is φ = 243014600844288.

The previous prime is 243017404255511. The next prime is 243017404255567. The reversal of 243017404255553 is 355552404710342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134670268981504 + 108347135274049 = 11604752^2 + 10408993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243017404255553 is a prime.

It is a super-2 number, since 2×243017404255553² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243017404255573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401575600 + ... + 1401748977.

It is an arithmetic number, because the mean of its divisors is an integer number (60755051916705).

Almost surely, 2^{243017404255553} is an apocalyptic number.

It is an amenable number.

243017404255553 is a deficient number, since it is larger than the sum of its proper divisors (2803411267).

243017404255553 is an equidigital number, since it uses as much as digits as its factorization.

243017404255553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803411266.

The product of its (nonzero) digits is 10080000, while the sum is 50.

Adding to 243017404255553 its reverse (355552404710342), we get a palindrome (598569808965895).

The spelling of 243017404255553 in words is "two hundred forty-three trillion, seventeen billion, four hundred four million, two hundred fifty-five thousand, five hundred fifty-three".