243123345423 has 60 divisors (see below), whose sum is σ = 422589507912. Its totient is φ = 138891503520.

The previous prime is 243123345397. The next prime is 243123345481. The reversal of 243123345423 is 324543321342.

243123345423 is a `hidden beast` number, since 2 + 4 + 312 + 334 + 5 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 243123345423 - 2¹⁴ = 243123329039 is a prime.

It is a super-2 number, since 2×243123345423² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243123345323) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 25758061 + ... + 25767497.

Almost surely, 2^243123345423 is an apocalyptic number.

243123345423 is a deficient number, since it is larger than the sum of its proper divisors (179466162489).

243123345423 is an equidigital number, since it uses as much as digits as its factorization.

243123345423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954 (or 15938 counting only the distinct ones).

The product of its digits is 207360, while the sum is 36.

Adding to 243123345423 its reverse (324543321342), we get a palindrome (567666666765).

The spelling of 243123345423 in words is "two hundred forty-three billion, one hundred twenty-three million, three hundred forty-five thousand, four hundred twenty-three".