128105205563 has 2 divisors, whose sum is σ = 128105205564. Its totient is φ = 128105205562.

The previous prime is 128105205493. The next prime is 128105205583. The reversal of 128105205563 is 365502501821.

It is a strong prime.

It is an emirp because it is prime and its reverse (365502501821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128105205563 - 2⁸ = 128105205307 is a prime.

It is a super-2 number, since 2×128105205563² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128105205583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64052602781 + 64052602782.

It is an arithmetic number, because the mean of its divisors is an integer number (64052602782).

Almost surely, 2^128105205563 is an apocalyptic number.

128105205563 is a deficient number, since it is larger than the sum of its proper divisors (1).

128105205563 is an equidigital number, since it uses as much as digits as its factorization.

128105205563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 128105205563 in words is "one hundred twenty-eight billion, one hundred five million, two hundred five thousand, five hundred sixty-three".