123120566543 has 16 divisors (see below), whose sum is σ = 133637255136. Its totient is φ = 112753729920.

The previous prime is 123120566509. The next prime is 123120566587. The reversal of 123120566543 is 345665021321.

It is a de Polignac number, because none of the positive numbers 2^k-123120566543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123120566497 and 123120566506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123120566593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9893321 + ... + 9905757.

It is an arithmetic number, because the mean of its divisors is an integer number (8352328446).

Almost surely, 2^123120566543 is an apocalyptic number.

123120566543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123120566543 is a deficient number, since it is larger than the sum of its proper divisors (10516688593).

123120566543 is a wasteful number, since it uses less digits than its factorization.

123120566543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18394.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 123120566543 its reverse (345665021321), we get a palindrome (468785587864).

The spelling of 123120566543 in words is "one hundred twenty-three billion, one hundred twenty million, five hundred sixty-six thousand, five hundred forty-three".