68816857 has 2 divisors, whose sum is σ = 68816858. Its totient is φ = 68816856.

The previous prime is 68816801. The next prime is 68816903. The reversal of 68816857 is 75861886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68740681 + 76176 = 8291^2 + 276^2 .

It is a cyclic number.

It is not a de Polignac number, because 68816857 - 2¹⁹ = 68292569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68816857.

It is not a weakly prime, because it can be changed into another prime (68817857) 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, 34408428 + 34408429.

It is an arithmetic number, because the mean of its divisors is an integer number (34408429).

Almost surely, 2^68816857 is an apocalyptic number.

It is an amenable number.

68816857 is a deficient number, since it is larger than the sum of its proper divisors (1).

68816857 is an equidigital number, since it uses as much as digits as its factorization.

68816857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 68816857 is about 8295.5926250027. The cubic root of 68816857 is about 409.7933858831.

The spelling of 68816857 in words is "sixty-eight million, eight hundred sixteen thousand, eight hundred fifty-seven".