128305001857 has 2 divisors, whose sum is σ = 128305001858. Its totient is φ = 128305001856.

The previous prime is 128305001779. The next prime is 128305001863. The reversal of 128305001857 is 758100503821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95135850481 + 33169151376 = 308441^2 + 182124^2 .

It is a cyclic number.

It is not a de Polignac number, because 128305001857 - 2⁷ = 128305001729 is a prime.

It is not a weakly prime, because it can be changed into another prime (128305001057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64152500928 + 64152500929.

It is an arithmetic number, because the mean of its divisors is an integer number (64152500929).

Almost surely, 2^128305001857 is an apocalyptic number.

It is an amenable number.

128305001857 is a deficient number, since it is larger than the sum of its proper divisors (1).

128305001857 is an equidigital number, since it uses as much as digits as its factorization.

128305001857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 128305001857 in words is "one hundred twenty-eight billion, three hundred five million, one thousand, eight hundred fifty-seven".