68816513 has 2 divisors, whose sum is σ = 68816514. Its totient is φ = 68816512.

The previous prime is 68816471. The next prime is 68816519. The reversal of 68816513 is 31561886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 16875664 = 7207^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 68816513 - 2¹⁶ = 68750977 is a prime.

It is a super-2 number, since 2×68816513² = 9471424922958338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68816519) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34408256 + 34408257.

It is an arithmetic number, because the mean of its divisors is an integer number (34408257).

Almost surely, 2^68816513 is an apocalyptic number.

It is an amenable number.

68816513 is a deficient number, since it is larger than the sum of its proper divisors (1).

68816513 is an equidigital number, since it uses as much as digits as its factorization.

68816513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 68816513 is about 8295.5718910754. The cubic root of 68816513 is about 409.7927030603.

The spelling of 68816513 in words is "sixty-eight million, eight hundred sixteen thousand, five hundred thirteen".