123543603501 has 4 divisors (see below), whose sum is σ = 164724804672. Its totient is φ = 82362402332.

The previous prime is 123543603497. The next prime is 123543603541. The reversal of 123543603501 is 105306345321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123543603501 - 2² = 123543603497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123543603541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20590600581 + ... + 20590600586.

It is an arithmetic number, because the mean of its divisors is an integer number (41181201168).

Almost surely, 2^123543603501 is an apocalyptic number.

It is an amenable number.

123543603501 is a deficient number, since it is larger than the sum of its proper divisors (41181201171).

123543603501 is an equidigital number, since it uses as much as digits as its factorization.

123543603501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41181201170.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 123543603501 its reverse (105306345321), we get a palindrome (228849948822).

The spelling of 123543603501 in words is "one hundred twenty-three billion, five hundred forty-three million, six hundred three thousand, five hundred one".