123545520424243 has 4 divisors (see below), whose sum is σ = 123745756276440. Its totient is φ = 123345284572048.

The previous prime is 123545520424237. The next prime is 123545520424267. The reversal of 123545520424243 is 342424025545321.

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

It is a cyclic number.

It is not a de Polignac number, because 123545520424243 - 2²⁵ = 123545486869811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123545520424193 and 123545520424202.

It is not an unprimeable number, because it can be changed into a prime (123545520424043) 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, 100117925173 + ... + 100117926406.

It is an arithmetic number, because the mean of its divisors is an integer number (30936439069110).

Almost surely, 2^{123545520424243} is an apocalyptic number.

123545520424243 is a deficient number, since it is larger than the sum of its proper divisors (200235852197).

123545520424243 is an equidigital number, since it uses as much as digits as its factorization.

123545520424243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200235852196.

The product of its (nonzero) digits is 4608000, while the sum is 46.

Adding to 123545520424243 its reverse (342424025545321), we get a palindrome (465969545969564).

The spelling of 123545520424243 in words is "one hundred twenty-three trillion, five hundred forty-five billion, five hundred twenty million, four hundred twenty-four thousand, two hundred forty-three".