200123543423 has 4 divisors (see below), whose sum is σ = 200700268680. Its totient is φ = 199546818168.

The previous prime is 200123543393. The next prime is 200123543443. The reversal of 200123543423 is 324345321002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200123543423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200123543443) 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, 288362108 + ... + 288362801.

It is an arithmetic number, because the mean of its divisors is an integer number (50175067170).

Almost surely, 2^200123543423 is an apocalyptic number.

200123543423 is a deficient number, since it is larger than the sum of its proper divisors (576725257).

200123543423 is an equidigital number, since it uses as much as digits as its factorization.

200123543423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576725256.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 200123543423 its reverse (324345321002), we get a palindrome (524468864425).

The spelling of 200123543423 in words is "two hundred billion, one hundred twenty-three million, five hundred forty-three thousand, four hundred twenty-three".