123511320543 has 16 divisors (see below), whose sum is σ = 177357624416. Its totient is φ = 76003522560.

The previous prime is 123511320533. The next prime is 123511320547. The reversal of 123511320543 is 345023115321.

It is not a de Polignac number, because 123511320543 - 2⁵ = 123511320511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123511320543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123511320547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1004271 + ... + 1120527.

It is an arithmetic number, because the mean of its divisors is an integer number (11084851526).

Almost surely, 2^123511320543 is an apocalyptic number.

123511320543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123511320543 is a deficient number, since it is larger than the sum of its proper divisors (53846303873).

123511320543 is a wasteful number, since it uses less digits than its factorization.

123511320543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143514.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 123511320543 its reverse (345023115321), we get a palindrome (468534435864).

The spelling of 123511320543 in words is "one hundred twenty-three billion, five hundred eleven million, three hundred twenty thousand, five hundred forty-three".