68708313613 has 4 divisors (see below), whose sum is σ = 70565295100. Its totient is φ = 66851332128.

The previous prime is 68708313599. The next prime is 68708313623. The reversal of 68708313613 is 31631380786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63914412969 + 4793900644 = 252813^2 + 69238^2 .

It is a cyclic number.

It is not a de Polignac number, because 68708313613 - 2²¹ = 68706216461 is a prime.

It is a super-2 number, since 2×68708313613² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68708313623) 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 3 ways as a sum of consecutive naturals, for example, 928490688 + ... + 928490761.

It is an arithmetic number, because the mean of its divisors is an integer number (17641323775).

Almost surely, 2^68708313613 is an apocalyptic number.

It is an amenable number.

68708313613 is a deficient number, since it is larger than the sum of its proper divisors (1856981487).

68708313613 is a wasteful number, since it uses less digits than its factorization.

68708313613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856981486.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 68708313613 in words is "sixty-eight billion, seven hundred eight million, three hundred thirteen thousand, six hundred thirteen".