6820204681 has 2 divisors, whose sum is σ = 6820204682. Its totient is φ = 6820204680.

The previous prime is 6820204667. The next prime is 6820204753. The reversal of 6820204681 is 1864020286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5360582656 + 1459622025 = 73216^2 + 38205^2 .

It is a cyclic number.

It is not a de Polignac number, because 6820204681 - 2⁷ = 6820204553 is a prime.

It is a super-2 number, since 2×6820204681² = 93030383781468623522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6820204681.

It is not a weakly prime, because it can be changed into another prime (6820204621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410102340 + 3410102341.

It is an arithmetic number, because the mean of its divisors is an integer number (3410102341).

Almost surely, 2^6820204681 is an apocalyptic number.

It is an amenable number.

6820204681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6820204681 is an equidigital number, since it uses as much as digits as its factorization.

6820204681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 6820204681 is about 82584.5305187358. The cubic root of 6820204681 is about 1896.4110163109.

The spelling of 6820204681 in words is "six billion, eight hundred twenty million, two hundred four thousand, six hundred eighty-one".