68820853865 has 16 divisors (see below), whose sum is σ = 83331235728. Its totient is φ = 54559389696.

The previous prime is 68820853817. The next prime is 68820853873. The reversal of 68820853865 is 56835802886.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8101980121 + 60718873744 = 90011^2 + 246412^2 .

It is a cyclic number.

It is not a de Polignac number, because 68820853865 - 2⁸ = 68820853609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 5153477 + ... + 5166813.

It is an arithmetic number, because the mean of its divisors is an integer number (5208202233).

Almost surely, 2^68820853865 is an apocalyptic number.

It is an amenable number.

68820853865 is a deficient number, since it is larger than the sum of its proper divisors (14510381863).

68820853865 is a wasteful number, since it uses less digits than its factorization.

68820853865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22588.

The product of its (nonzero) digits is 22118400, while the sum is 59.

The spelling of 68820853865 in words is "sixty-eight billion, eight hundred twenty million, eight hundred fifty-three thousand, eight hundred sixty-five".