6721549073 has 2 divisors, whose sum is σ = 6721549074. Its totient is φ = 6721549072.

The previous prime is 6721549057. The next prime is 6721549127. The reversal of 6721549073 is 3709451276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5887032529 + 834516544 = 76727^2 + 28888^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721549073 - 2⁴ = 6721549057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6721549013) 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 as a sum of consecutive naturals, namely, 3360774536 + 3360774537.

It is an arithmetic number, because the mean of its divisors is an integer number (3360774537).

Almost surely, 2^6721549073 is an apocalyptic number.

It is an amenable number.

6721549073 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721549073 is an equidigital number, since it uses as much as digits as its factorization.

6721549073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 6721549073 is about 81985.0539610727. The cubic root of 6721549073 is about 1887.2225820253. Note that the first 3 decimals are identical.

The spelling of 6721549073 in words is "six billion, seven hundred twenty-one million, five hundred forty-nine thousand, seventy-three".