340128642257 has 2 divisors, whose sum is σ = 340128642258. Its totient is φ = 340128642256.

The previous prime is 340128642157. The next prime is 340128642283. The reversal of 340128642257 is 752246821043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339893664016 + 234978241 = 583004^2 + 15329^2 .

It is a cyclic number.

It is not a de Polignac number, because 340128642257 - 2¹⁰ = 340128641233 is a prime.

It is not a weakly prime, because it can be changed into another prime (340128642157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170064321128 + 170064321129.

It is an arithmetic number, because the mean of its divisors is an integer number (170064321129).

Almost surely, 2^340128642257 is an apocalyptic number.

It is an amenable number.

340128642257 is a deficient number, since it is larger than the sum of its proper divisors (1).

340128642257 is an equidigital number, since it uses as much as digits as its factorization.

340128642257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 340128642257 in words is "three hundred forty billion, one hundred twenty-eight million, six hundred forty-two thousand, two hundred fifty-seven".