6496547821 has 2 divisors, whose sum is σ = 6496547822. Its totient is φ = 6496547820.

The previous prime is 6496547803. The next prime is 6496547833. The reversal of 6496547821 is 1287456946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3543820900 + 2952726921 = 59530^2 + 54339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6496547821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6490547821) 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, 3248273910 + 3248273911.

It is an arithmetic number, because the mean of its divisors is an integer number (3248273911).

Almost surely, 2^6496547821 is an apocalyptic number.

It is an amenable number.

6496547821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6496547821 is an equidigital number, since it uses as much as digits as its factorization.

6496547821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 52.

The square root of 6496547821 is about 80601.1651342585. The cubic root of 6496547821 is about 1865.9251276791.

The spelling of 6496547821 in words is "six billion, four hundred ninety-six million, five hundred forty-seven thousand, eight hundred twenty-one".