123543521532220 has 12 divisors (see below), whose sum is σ = 259441395217704. Its totient is φ = 49417408612880.

The previous prime is 123543521532209. The next prime is 123543521532253. The reversal of 123543521532220 is 22235125345321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3088588038286 + ... + 3088588038325.

It is an arithmetic number, because the mean of its divisors is an integer number (21620116268142).

Almost surely, 2^{123543521532220} is an apocalyptic number.

123543521532220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123543521532220 is an abundant number, since it is smaller than the sum of its proper divisors (135897873685484).

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

123543521532220 is a wasteful number, since it uses less digits than its factorization.

123543521532220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6177176076620 (or 6177176076618 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 123543521532220 its reverse (22235125345321), we get a palindrome (145778646877541).

The spelling of 123543521532220 in words is "one hundred twenty-three trillion, five hundred forty-three billion, five hundred twenty-one million, five hundred thirty-two thousand, two hundred twenty".