68821486821 has 6 divisors (see below), whose sum is σ = 99408814310. Its totient is φ = 45880991208.

The previous prime is 68821486753. The next prime is 68821486841. The reversal of 68821486821 is 12868412886.

68821486821 is a `hidden beast` number, since 6 + 8 + 82 + 1 + 486 + 82 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68808634596 + 12852225 = 262314^2 + 3585^2 .

It is not a de Polignac number, because 68821486821 - 2²² = 68817292517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68821486841) 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 in 5 ways as a sum of consecutive naturals, for example, 3823415926 + ... + 3823415943.

Almost surely, 2^68821486821 is an apocalyptic number.

It is an amenable number.

68821486821 is a deficient number, since it is larger than the sum of its proper divisors (30587327489).

68821486821 is a wasteful number, since it uses less digits than its factorization.

68821486821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7646831875 (or 7646831872 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 54.

The spelling of 68821486821 in words is "sixty-eight billion, eight hundred twenty-one million, four hundred eighty-six thousand, eight hundred twenty-one".