68564813 has 2 divisors, whose sum is σ = 68564814. Its totient is φ = 68564812.

The previous prime is 68564789. The next prime is 68564831. The reversal of 68564813 is 31846586.

Together with next prime (68564831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37002889 + 31561924 = 6083^2 + 5618^2 .

It is a cyclic number.

It is not a de Polignac number, because 68564813 - 2¹⁴ = 68548429 is a prime.

It is a super-2 number, since 2×68564813² = 9402267163449938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68564413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34282406 + 34282407.

It is an arithmetic number, because the mean of its divisors is an integer number (34282407).

Almost surely, 2^68564813 is an apocalyptic number.

It is an amenable number.

68564813 is a deficient number, since it is larger than the sum of its proper divisors (1).

68564813 is an equidigital number, since it uses as much as digits as its factorization.

68564813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 68564813 is about 8280.3872493984. The cubic root of 68564813 is about 409.2924799426.

The spelling of 68564813 in words is "sixty-eight million, five hundred sixty-four thousand, eight hundred thirteen".