68500000685 has 16 divisors (see below), whose sum is σ = 87670604016. Its totient is φ = 51199991808.

The previous prime is 68500000637. The next prime is 68500000697. The reversal of 68500000685 is 58600000586.

It can be written as a sum of positive squares in 8 ways, for example, as 4821496969 + 63678503716 = 69437^2 + 252346^2 .

It is not a de Polignac number, because 68500000685 - 2²⁸ = 68231565229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2929532 + ... + 2952821.

It is an arithmetic number, because the mean of its divisors is an integer number (5479412751).

Almost surely, 2^68500000685 is an apocalyptic number.

It is an amenable number.

68500000685 is a deficient number, since it is larger than the sum of its proper divisors (19170603331).

68500000685 is a wasteful number, since it uses less digits than its factorization.

68500000685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882512.

The product of its (nonzero) digits is 57600, while the sum is 38.

Subtracting from 68500000685 its reverse (58600000586), we obtain a palindrome (9900000099).

The spelling of 68500000685 in words is "sixty-eight billion, five hundred million, six hundred eighty-five", and thus it is an aban number.