68131313081 has 8 divisors (see below), whose sum is σ = 73377307080. Its totient is φ = 62886051072.

The previous prime is 68131313059. The next prime is 68131313179. The reversal of 68131313081 is 18031313186.

It can be written as a sum of positive squares in 4 ways, for example, as 12651750400 + 55479562681 = 112480^2 + 235541^2 .

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

It is not a de Polignac number, because 68131313081 - 2⁶ = 68131313017 is a prime.

It is a super-2 number, since 2×68131313081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68131313011) 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, 18551 + ... + 369603.

It is an arithmetic number, because the mean of its divisors is an integer number (9172163385).

Almost surely, 2^68131313081 is an apocalyptic number.

It is an amenable number.

68131313081 is a deficient number, since it is larger than the sum of its proper divisors (5245993999).

68131313081 is a wasteful number, since it uses less digits than its factorization.

68131313081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365995.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 68131313081 in words is "sixty-eight billion, one hundred thirty-one million, three hundred thirteen thousand, eighty-one".