68680681 has 2 divisors, whose sum is σ = 68680682. Its totient is φ = 68680680.

The previous prime is 68680657. The next prime is 68680721. The reversal of 68680681 is 18608686.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 11451456 = 7565^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 68680681 - 2¹⁹ = 68156393 is a prime.

It is a super-2 number, since 2×68680681² = 9434071885247522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68680081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34340340 + 34340341.

It is an arithmetic number, because the mean of its divisors is an integer number (34340341).

Almost surely, 2^68680681 is an apocalyptic number.

It is an amenable number.

68680681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68680681 is an equidigital number, since it uses as much as digits as its factorization.

68680681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 68680681 is about 8287.3808287058. The cubic root of 68680681 is about 409.5229052881.

The spelling of 68680681 in words is "sixty-eight million, six hundred eighty thousand, six hundred eighty-one".