123240225543 has 4 divisors (see below), whose sum is σ = 164320300728. Its totient is φ = 82160150360.

The previous prime is 123240225541. The next prime is 123240225569. The reversal of 123240225543 is 345522042321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345522042321 = 3 ⋅115174014107.

It is a cyclic number.

It is not a de Polignac number, because 123240225543 - 2¹ = 123240225541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123240225541) 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, 20540037588 + ... + 20540037593.

It is an arithmetic number, because the mean of its divisors is an integer number (41080075182).

Almost surely, 2^123240225543 is an apocalyptic number.

123240225543 is a deficient number, since it is larger than the sum of its proper divisors (41080075185).

123240225543 is an equidigital number, since it uses as much as digits as its factorization.

123240225543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41080075184.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 123240225543 its reverse (345522042321), we get a palindrome (468762267864).

The spelling of 123240225543 in words is "one hundred twenty-three billion, two hundred forty million, two hundred twenty-five thousand, five hundred forty-three".