243320405523 has 8 divisors (see below), whose sum is σ = 349383146448. Its totient is φ = 149735634144.

The previous prime is 243320405501. The next prime is 243320405567. The reversal of 243320405523 is 325504023342.

243320405523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243320405523 - 2²⁶ = 243253296659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243320405123) 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 7 ways as a sum of consecutive naturals, for example, 3119492340 + ... + 3119492417.

It is an arithmetic number, because the mean of its divisors is an integer number (43672893306).

Almost surely, 2^243320405523 is an apocalyptic number.

243320405523 is a deficient number, since it is larger than the sum of its proper divisors (106062740925).

243320405523 is a wasteful number, since it uses less digits than its factorization.

243320405523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6238984773.

The product of its (nonzero) digits is 86400, while the sum is 33.

Adding to 243320405523 its reverse (325504023342), we get a palindrome (568824428865).

The spelling of 243320405523 in words is "two hundred forty-three billion, three hundred twenty million, four hundred five thousand, five hundred twenty-three".