6800639921 has 2 divisors, whose sum is σ = 6800639922. Its totient is φ = 6800639920.

The previous prime is 6800639899. The next prime is 6800639927. The reversal of 6800639921 is 1299360086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6783334321 + 17305600 = 82361^2 + 4160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6800639921 is a prime.

It is not a weakly prime, because it can be changed into another prime (6800639927) 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, 3400319960 + 3400319961.

It is an arithmetic number, because the mean of its divisors is an integer number (3400319961).

Almost surely, 2^6800639921 is an apocalyptic number.

It is an amenable number.

6800639921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6800639921 is an equidigital number, since it uses as much as digits as its factorization.

6800639921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 6800639921 is about 82465.9925120652. The cubic root of 6800639921 is about 1894.5959016094.

The spelling of 6800639921 in words is "six billion, eight hundred million, six hundred thirty-nine thousand, nine hundred twenty-one".