128705663 has 2 divisors, whose sum is σ = 128705664. Its totient is φ = 128705662.

The previous prime is 128705653. The next prime is 128705671. The reversal of 128705663 is 366507821.

It is a strong prime.

It is an emirp because it is prime and its reverse (366507821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128705663 - 2¹² = 128701567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128705653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64352831 + 64352832.

It is an arithmetic number, because the mean of its divisors is an integer number (64352832).

Almost surely, 2^128705663 is an apocalyptic number.

128705663 is a deficient number, since it is larger than the sum of its proper divisors (1).

128705663 is an equidigital number, since it uses as much as digits as its factorization.

128705663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 128705663 is about 11344.8518280320. The cubic root of 128705663 is about 504.8928478994.

The spelling of 128705663 in words is "one hundred twenty-eight million, seven hundred five thousand, six hundred sixty-three".