68557843 has 2 divisors, whose sum is σ = 68557844. Its totient is φ = 68557842.

The previous prime is 68557829. The next prime is 68557849. The reversal of 68557843 is 34875586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68557843 - 2⁹ = 68557331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68557793 and 68557802.

It is not a weakly prime, because it can be changed into another prime (68557849) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34278921 + 34278922.

It is an arithmetic number, because the mean of its divisors is an integer number (34278922).

Almost surely, 2^68557843 is an apocalyptic number.

68557843 is a deficient number, since it is larger than the sum of its proper divisors (1).

68557843 is an equidigital number, since it uses as much as digits as its factorization.

68557843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 46.

The square root of 68557843 is about 8279.9663646660. The cubic root of 68557843 is about 409.2786105096.

The spelling of 68557843 in words is "sixty-eight million, five hundred fifty-seven thousand, eight hundred forty-three".