68426681 has 2 divisors, whose sum is σ = 68426682. Its totient is φ = 68426680.

The previous prime is 68426629. The next prime is 68426693. The reversal of 68426681 is 18662486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56866681 + 11560000 = 7541^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 68426681 - 2¹⁰ = 68425657 is a prime.

It is a super-2 number, since 2×68426681² = 9364421345351522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68426381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34213340 + 34213341.

It is an arithmetic number, because the mean of its divisors is an integer number (34213341).

Almost surely, 2^68426681 is an apocalyptic number.

It is an amenable number.

68426681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68426681 is an equidigital number, since it uses as much as digits as its factorization.

68426681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 41.

The square root of 68426681 is about 8272.0421299701. The cubic root of 68426681 is about 409.0174389736.

The spelling of 68426681 in words is "sixty-eight million, four hundred twenty-six thousand, six hundred eighty-one".