128200420085 has 16 divisors (see below), whose sum is σ = 154357790400. Its totient is φ = 102216057216.

The previous prime is 128200420081. The next prime is 128200420133. The reversal of 128200420085 is 580024002821.

It is a cyclic number.

It is not a de Polignac number, because 128200420085 - 2² = 128200420081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128200420081) 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 in 15 ways as a sum of consecutive naturals, for example, 1766801 + ... + 1837929.

It is an arithmetic number, because the mean of its divisors is an integer number (9647361900).

Almost surely, 2^128200420085 is an apocalyptic number.

It is an amenable number.

128200420085 is a deficient number, since it is larger than the sum of its proper divisors (26157370315).

128200420085 is an equidigital number, since it uses as much as digits as its factorization.

128200420085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72340.

The product of its (nonzero) digits is 10240, while the sum is 32.

The spelling of 128200420085 in words is "one hundred twenty-eight billion, two hundred million, four hundred twenty thousand, eighty-five".