128393722049 has 2 divisors, whose sum is σ = 128393722050. Its totient is φ = 128393722048.

The previous prime is 128393722033. The next prime is 128393722069. The reversal of 128393722049 is 940227393821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75306336400 + 53087385649 = 274420^2 + 230407^2 .

It is an emirp because it is prime and its reverse (940227393821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128393722049 - 2⁴ = 128393722033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128393721988 and 128393722006.

It is not a weakly prime, because it can be changed into another prime (128393722069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64196861024 + 64196861025.

It is an arithmetic number, because the mean of its divisors is an integer number (64196861025).

Almost surely, 2^128393722049 is an apocalyptic number.

It is an amenable number.

128393722049 is a deficient number, since it is larger than the sum of its proper divisors (1).

128393722049 is an equidigital number, since it uses as much as digits as its factorization.

128393722049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 128393722049 in words is "one hundred twenty-eight billion, three hundred ninety-three million, seven hundred twenty-two thousand, forty-nine".