1328449548721 has 2 divisors, whose sum is σ = 1328449548722. Its totient is φ = 1328449548720.

The previous prime is 1328449548659. The next prime is 1328449548733. The reversal of 1328449548721 is 1278459448231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1248225217600 + 80224331121 = 1117240^2 + 283239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328449548721 - 2⁷ = 1328449548593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1328449548791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664224774360 + 664224774361.

It is an arithmetic number, because the mean of its divisors is an integer number (664224774361).

Almost surely, 2^{1328449548721} is an apocalyptic number.

It is an amenable number.

1328449548721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328449548721 is an equidigital number, since it uses as much as digits as its factorization.

1328449548721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15482880, while the sum is 58.

The spelling of 1328449548721 in words is "one trillion, three hundred twenty-eight billion, four hundred forty-nine million, five hundred forty-eight thousand, seven hundred twenty-one".