6484438721 has 2 divisors, whose sum is σ = 6484438722. Its totient is φ = 6484438720.

The previous prime is 6484438711. The next prime is 6484438729. The reversal of 6484438721 is 1278344846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6285318400 + 199120321 = 79280^2 + 14111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6484438721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6484438729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3242219360 + 3242219361.

It is an arithmetic number, because the mean of its divisors is an integer number (3242219361).

Almost surely, 2^6484438721 is an apocalyptic number.

It is an amenable number.

6484438721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6484438721 is an equidigital number, since it uses as much as digits as its factorization.

6484438721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 47.

The square root of 6484438721 is about 80526.0126977612. The cubic root of 6484438721 is about 1864.7650896904.

The spelling of 6484438721 in words is "six billion, four hundred eighty-four million, four hundred thirty-eight thousand, seven hundred twenty-one".