123550231040505 has 24 divisors (see below), whose sum is σ = 214514869994568. Its totient is φ = 65782337726976.

The previous prime is 123550231040503. The next prime is 123550231040623. The reversal of 123550231040505 is 505040132055321.

123550231040505 is a `hidden beast` number, since 1 + 2 + 3 + 550 + 2 + 3 + 10 + 40 + 50 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22003576495209 + 101546654545296 = 4690797^2 + 10077036^2 .

It is not a de Polignac number, because 123550231040505 - 2¹ = 123550231040503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123550231040505.

It is not an unprimeable number, because it can be changed into a prime (123550231040501) 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 23 ways as a sum of consecutive naturals, for example, 2314948602 + ... + 2315001971.

It is an arithmetic number, because the mean of its divisors is an integer number (8938119583107).

Almost surely, 2^{123550231040505} is an apocalyptic number.

123550231040505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123550231040505 is a deficient number, since it is larger than the sum of its proper divisors (90964638954063).

123550231040505 is a wasteful number, since it uses less digits than its factorization.

123550231040505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629951177 (or 4629951174 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 123550231040505 its reverse (505040132055321), we get a palindrome (628590363095826).

The spelling of 123550231040505 in words is "one hundred twenty-three trillion, five hundred fifty billion, two hundred thirty-one million, forty thousand, five hundred five".