68355808505 has 32 divisors (see below), whose sum is σ = 85340960640. Its totient is φ = 52497768960.

The previous prime is 68355808463. The next prime is 68355808537. The reversal of 68355808505 is 50580855386.

It is a de Polignac number, because none of the positive numbers 2^k-68355808505 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 22285982 + ... + 22289048.

It is an arithmetic number, because the mean of its divisors is an integer number (2666905020).

Almost surely, 2^68355808505 is an apocalyptic number.

It is an amenable number.

68355808505 is a deficient number, since it is larger than the sum of its proper divisors (16985152135).

68355808505 is a wasteful number, since it uses less digits than its factorization.

68355808505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929.

The product of its (nonzero) digits is 5760000, while the sum is 53.

The spelling of 68355808505 in words is "sixty-eight billion, three hundred fifty-five million, eight hundred eight thousand, five hundred five".