123523543520 has 96 divisors (see below), whose sum is σ = 314491621248. Its totient is φ = 45576880128.

The previous prime is 123523543511. The next prime is 123523543523. The reversal of 123523543520 is 25345325321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123523543523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3072992 + ... + 3112928.

It is an arithmetic number, because the mean of its divisors is an integer number (3275954388).

Almost surely, 2^123523543520 is an apocalyptic number.

123523543520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123523543520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157245810624).

123523543520 is an abundant number, since it is smaller than the sum of its proper divisors (190968077728).

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

123523543520 is a wasteful number, since it uses less digits than its factorization.

123523543520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41452 (or 41444 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 123523543520 its reverse (25345325321), we get a palindrome (148868868841).

The spelling of 123523543520 in words is "one hundred twenty-three billion, five hundred twenty-three million, five hundred forty-three thousand, five hundred twenty".