6404272102721 has 2 divisors, whose sum is σ = 6404272102722. Its totient is φ = 6404272102720.

The previous prime is 6404272102691. The next prime is 6404272102819. The reversal of 6404272102721 is 1272012724046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5820209325121 + 584062777600 = 2412511^2 + 764240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6404272102721 is a prime.

It is not a weakly prime, because it can be changed into another prime (6404272102121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202136051360 + 3202136051361.

It is an arithmetic number, because the mean of its divisors is an integer number (3202136051361).

Almost surely, 2^{6404272102721} is an apocalyptic number.

It is an amenable number.

6404272102721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404272102721 is an equidigital number, since it uses as much as digits as its factorization.

6404272102721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

Adding to 6404272102721 its reverse (1272012724046), we get a palindrome (7676284826767).

The spelling of 6404272102721 in words is "six trillion, four hundred four billion, two hundred seventy-two million, one hundred two thousand, seven hundred twenty-one".