128305001779 has 2 divisors, whose sum is σ = 128305001780. Its totient is φ = 128305001778.

The previous prime is 128305001729. The next prime is 128305001857. The reversal of 128305001779 is 977100503821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128305001779 - 2²³ = 128296613171 is a prime.

It is not a weakly prime, because it can be changed into another prime (128305001729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64152500889 + 64152500890.

It is an arithmetic number, because the mean of its divisors is an integer number (64152500890).

Almost surely, 2^128305001779 is an apocalyptic number.

128305001779 is a deficient number, since it is larger than the sum of its proper divisors (1).

128305001779 is an equidigital number, since it uses as much as digits as its factorization.

128305001779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 128305001779 in words is "one hundred twenty-eight billion, three hundred five million, one thousand, seven hundred seventy-nine".