20128498536385 has 16 divisors (see below), whose sum is σ = 24203030060880. Its totient is φ = 16070247889920.

The previous prime is 20128498536353. The next prime is 20128498536389. The reversal of 20128498536385 is 58363589482102.

It can be written as a sum of positive squares in 8 ways, for example, as 350350345216 + 19778148191169 = 591904^2 + 4447263^2 .

It is not a de Polignac number, because 20128498536385 - 2⁵ = 20128498536353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20128498536389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46390645 + ... + 46822525.

It is an arithmetic number, because the mean of its divisors is an integer number (1512689378805).

Almost surely, 2^{20128498536385} is an apocalyptic number.

It is an amenable number.

20128498536385 is a deficient number, since it is larger than the sum of its proper divisors (4074531524495).

20128498536385 is a wasteful number, since it uses less digits than its factorization.

20128498536385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450708.

The product of its (nonzero) digits is 99532800, while the sum is 64.

The spelling of 20128498536385 in words is "twenty trillion, one hundred twenty-eight billion, four hundred ninety-eight million, five hundred thirty-six thousand, three hundred eighty-five".