123675421668 has 72 divisors (see below), whose sum is σ = 314033080032. Its totient is φ = 37751394816.

The previous prime is 123675421607. The next prime is 123675421691. The reversal of 123675421668 is 866124576321.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 123675421668.

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 23 ways as a sum of consecutive naturals, for example, 57855 + ... + 500697.

It is an arithmetic number, because the mean of its divisors is an integer number (4361570556).

Almost surely, 2^123675421668 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 123675421668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157016540016).

123675421668 is an abundant number, since it is smaller than the sum of its proper divisors (190357658364).

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

123675421668 is a wasteful number, since it uses less digits than its factorization.

123675421668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442941 (or 442902 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

Adding to 123675421668 its reverse (866124576321), we get a palindrome (989799997989).

The spelling of 123675421668 in words is "one hundred twenty-three billion, six hundred seventy-five million, four hundred twenty-one thousand, six hundred sixty-eight".