123243442354545 has 16 divisors (see below), whose sum is σ = 197209460398272. Its totient is φ = 65723185045440.

The previous prime is 123243442354531. The next prime is 123243442354547. The reversal of 123243442354545 is 545453244342321.

It is not a de Polignac number, because 123243442354545 - 2¹¹ = 123243442352497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123243442354547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415526626 + ... + 415823115.

It is an arithmetic number, because the mean of its divisors is an integer number (12325591274892).

Almost surely, 2^{123243442354545} is an apocalyptic number.

123243442354545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123243442354545 is a deficient number, since it is larger than the sum of its proper divisors (73966018043727).

123243442354545 is an equidigital number, since it uses as much as digits as its factorization.

123243442354545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831359632.

The product of its digits is 27648000, while the sum is 51.

Adding to 123243442354545 its reverse (545453244342321), we get a palindrome (668696686696866).

The spelling of 123243442354545 in words is "one hundred twenty-three trillion, two hundred forty-three billion, four hundred forty-two million, three hundred fifty-four thousand, five hundred forty-five".