68405851 has 2 divisors, whose sum is σ = 68405852. Its totient is φ = 68405850.

The previous prime is 68405801. The next prime is 68405903. The reversal of 68405851 is 15850486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68405851 - 2⁷ = 68405723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68405851.

It is not a weakly prime, because it can be changed into another prime (68405801) 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, 34202925 + 34202926.

It is an arithmetic number, because the mean of its divisors is an integer number (34202926).

Almost surely, 2^68405851 is an apocalyptic number.

68405851 is a deficient number, since it is larger than the sum of its proper divisors (1).

68405851 is an equidigital number, since it uses as much as digits as its factorization.

68405851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 68405851 is about 8270.7829738181. The cubic root of 68405851 is about 408.9759312957.

The spelling of 68405851 in words is "sixty-eight million, four hundred five thousand, eight hundred fifty-one".