1572728728577 has 2 divisors, whose sum is σ = 1572728728578. Its totient is φ = 1572728728576.

The previous prime is 1572728728537. The next prime is 1572728728619. The reversal of 1572728728577 is 7758278272751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447921263616 + 124807464961 = 1203296^2 + 353281^2 .

It is an emirp because it is prime and its reverse (7758278272751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1572728728577 - 2⁶ = 1572728728513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1572728728537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786364364288 + 786364364289.

It is an arithmetic number, because the mean of its divisors is an integer number (786364364289).

Almost surely, 2^{1572728728577} is an apocalyptic number.

It is an amenable number.

1572728728577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572728728577 is an equidigital number, since it uses as much as digits as its factorization.

1572728728577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215129600, while the sum is 68.

The spelling of 1572728728577 in words is "one trillion, five hundred seventy-two billion, seven hundred twenty-eight million, seven hundred twenty-eight thousand, five hundred seventy-seven".