68854809605 has 4 divisors (see below), whose sum is σ = 82625771532. Its totient is φ = 55083847680.

The previous prime is 68854809601. The next prime is 68854809607. The reversal of 68854809605 is 50690845886.

It is a Cunningham number, because it is equal to 262402²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50690845886 = 2 ⋅25345422943.

It can be written as a sum of positive squares in 2 ways, for example, as 24787983364 + 44066826241 = 157442^2 + 209921^2 .

It is not a de Polignac number, because 68854809605 - 2² = 68854809601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68854809601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6885480956 + ... + 6885480965.

It is an arithmetic number, because the mean of its divisors is an integer number (20656442883).

Almost surely, 2^68854809605 is an apocalyptic number.

It is an amenable number.

68854809605 is a deficient number, since it is larger than the sum of its proper divisors (13770961927).

68854809605 is a wasteful number, since it uses less digits than its factorization.

68854809605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13770961926.

The product of its (nonzero) digits is 16588800, while the sum is 59.

The spelling of 68854809605 in words is "sixty-eight billion, eight hundred fifty-four million, eight hundred nine thousand, six hundred five".