123042544236 has 120 divisors (see below), whose sum is σ = 325987898544. Its totient is φ = 40463418240.

The previous prime is 123042544217. The next prime is 123042544241. The reversal of 123042544236 is 632445240321.

123042544236 is a `hidden beast` number, since 12 + 30 + 42 + 544 + 2 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 123042544236.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22075546 + ... + 22081118.

Almost surely, 2^123042544236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123042544236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162993949272).

123042544236 is an abundant number, since it is smaller than the sum of its proper divisors (202945354308).

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

123042544236 is a wasteful number, since it uses less digits than its factorization.

123042544236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6493 (or 6482 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 123042544236 its reverse (632445240321), we get a palindrome (755487784557).

The spelling of 123042544236 in words is "one hundred twenty-three billion, forty-two million, five hundred forty-four thousand, two hundred thirty-six".