68220315313 has 4 divisors (see below), whose sum is σ = 68228514340. Its totient is φ = 68212116288.

The previous prime is 68220315311. The next prime is 68220315391. The reversal of 68220315313 is 31351302286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31351302286 = 2 ⋅15675651143.

It can be written as a sum of positive squares in 2 ways, for example, as 29879542449 + 38340772864 = 172857^2 + 195808^2 .

It is a cyclic number.

It is not a de Polignac number, because 68220315313 - 2¹ = 68220315311 is a prime.

It is a super-2 number, since 2×68220315313² (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 (68220315311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4087020 + ... + 4103677.

It is an arithmetic number, because the mean of its divisors is an integer number (17057128585).

Almost surely, 2^68220315313 is an apocalyptic number.

It is an amenable number.

68220315313 is a deficient number, since it is larger than the sum of its proper divisors (8199027).

68220315313 is an equidigital number, since it uses as much as digits as its factorization.

68220315313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8199026.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 68220315313 its reverse (31351302286), we get a palindrome (99571617599).

The spelling of 68220315313 in words is "sixty-eight billion, two hundred twenty million, three hundred fifteen thousand, three hundred thirteen".