123511543122 has 64 divisors (see below), whose sum is σ = 274681414656. Its totient is φ = 36705888960.

The previous prime is 123511543063. The next prime is 123511543153. The reversal of 123511543122 is 221345115321.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 123511543122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10148613 + ... + 10160775.

It is an arithmetic number, because the mean of its divisors is an integer number (4291897104).

Almost surely, 2^123511543122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123511543122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137340707328).

123511543122 is an abundant number, since it is smaller than the sum of its proper divisors (151169871534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123511543122 is a wasteful number, since it uses less digits than its factorization.

123511543122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15135.

The product of its digits is 7200, while the sum is 30.

Adding to 123511543122 its reverse (221345115321), we get a palindrome (344856658443).

The spelling of 123511543122 in words is "one hundred twenty-three billion, five hundred eleven million, five hundred forty-three thousand, one hundred twenty-two".