123012320015540 has 24 divisors (see below), whose sum is σ = 266658964680192. Its totient is φ = 47617672263840.

The previous prime is 123012320015461. The next prime is 123012320015569. The reversal of 123012320015540 is 45510023210321.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99203483264 + ... + 99203484503.

It is an arithmetic number, because the mean of its divisors is an integer number (11110790195008).

Almost surely, 2^{123012320015540} is an apocalyptic number.

123012320015540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123012320015540 is an abundant number, since it is smaller than the sum of its proper divisors (143646644664652).

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

123012320015540 is a wasteful number, since it uses less digits than its factorization.

123012320015540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198406967807 (or 198406967805 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 123012320015540 its reverse (45510023210321), we get a palindrome (168522343225861).

The spelling of 123012320015540 in words is "one hundred twenty-three trillion, twelve billion, three hundred twenty million, fifteen thousand, five hundred forty".