68439615918 has 16 divisors (see below), whose sum is σ = 136883393616. Its totient is φ = 22812511680.

The previous prime is 68439615911. The next prime is 68439615919. The reversal of 68439615918 is 81951693486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68439615911) 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 7 ways as a sum of consecutive naturals, for example, 65748 + ... + 375768.

It is an arithmetic number, because the mean of its divisors is an integer number (8555212101).

Almost surely, 2^68439615918 is an apocalyptic number.

68439615918 is an abundant number, since it is smaller than the sum of its proper divisors (68443777698).

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

68439615918 is a wasteful number, since it uses less digits than its factorization.

68439615918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346819.

The product of its digits is 11197440, while the sum is 60.

The spelling of 68439615918 in words is "sixty-eight billion, four hundred thirty-nine million, six hundred fifteen thousand, nine hundred eighteen".