6700860821 has 2 divisors, whose sum is σ = 6700860822. Its totient is φ = 6700860820.

The previous prime is 6700860787. The next prime is 6700860823. The reversal of 6700860821 is 1280680076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4426906225 + 2273954596 = 66535^2 + 47686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6700860821 is a prime.

It is a Sophie Germain prime.

Together with 6700860823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6700860823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3350430410 + 3350430411.

It is an arithmetic number, because the mean of its divisors is an integer number (3350430411).

Almost surely, 2^6700860821 is an apocalyptic number.

It is an amenable number.

6700860821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6700860821 is an equidigital number, since it uses as much as digits as its factorization.

6700860821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 6700860821 is about 81858.7858510007. The cubic root of 6700860821 is about 1885.2843650200.

The spelling of 6700860821 in words is "six billion, seven hundred million, eight hundred sixty thousand, eight hundred twenty-one".