68446421 has 2 divisors, whose sum is σ = 68446422. Its totient is φ = 68446420.

The previous prime is 68446397. The next prime is 68446451. The reversal of 68446421 is 12464486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 27984100 = 6361^2 + 5290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68446421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68446451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34223210 + 34223211.

It is an arithmetic number, because the mean of its divisors is an integer number (34223211).

Almost surely, 2^68446421 is an apocalyptic number.

It is an amenable number.

68446421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68446421 is an equidigital number, since it uses as much as digits as its factorization.

68446421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 35.

The square root of 68446421 is about 8273.2352196707. The cubic root of 68446421 is about 409.0567668491.

The spelling of 68446421 in words is "sixty-eight million, four hundred forty-six thousand, four hundred twenty-one".