68131508605 has 8 divisors (see below), whose sum is σ = 81885361464. Its totient is φ = 54420172800.

The previous prime is 68131508593. The next prime is 68131508611. The reversal of 68131508605 is 50680513186.

It can be written as a sum of positive squares in 4 ways, for example, as 14161714009 + 53969794596 = 119003^2 + 232314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68131508605 - 2¹⁷ = 68131377533 is a prime.

It is a Duffinian number.

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, 10625736 + ... + 10632145.

It is an arithmetic number, because the mean of its divisors is an integer number (10235670183).

Almost surely, 2^68131508605 is an apocalyptic number.

It is an amenable number.

68131508605 is a deficient number, since it is larger than the sum of its proper divisors (13753852859).

68131508605 is a wasteful number, since it uses less digits than its factorization.

68131508605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21258527.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 68131508605 in words is "sixty-eight billion, one hundred thirty-one million, five hundred eight thousand, six hundred five".