6921256753 has 2 divisors, whose sum is σ = 6921256754. Its totient is φ = 6921256752.

The previous prime is 6921256739. The next prime is 6921256759. The reversal of 6921256753 is 3576521296.

6921256753 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4737844224 + 2183412529 = 68832^2 + 46727^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921256753 - 2⁵ = 6921256721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6921256759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460628376 + 3460628377.

It is an arithmetic number, because the mean of its divisors is an integer number (3460628377).

Almost surely, 2^6921256753 is an apocalyptic number.

It is an amenable number.

6921256753 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921256753 is an equidigital number, since it uses as much as digits as its factorization.

6921256753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The square root of 6921256753 is about 83194.0908538581. The cubic root of 6921256753 is about 1905.7312406431.

The spelling of 6921256753 in words is "six billion, nine hundred twenty-one million, two hundred fifty-six thousand, seven hundred fifty-three".