122028128645 has 18 divisors (see below), whose sum is σ = 151685470482. Its totient is φ = 94238712736.

The previous prime is 122028128617. The next prime is 122028128669. The reversal of 122028128645 is 546821820221.

It can be written as a sum of positive squares in 3 ways, for example, as 14045568196 + 107982560449 = 118514^2 + 328607^2 .

It is not a de Polignac number, because 122028128645 - 2¹⁶ = 122028063109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 17 ways as a sum of consecutive naturals, for example, 22649642 + ... + 22655028.

Almost surely, 2^122028128645 is an apocalyptic number.

It is an amenable number.

122028128645 is a deficient number, since it is larger than the sum of its proper divisors (29657341837).

122028128645 is an frugal number, since it uses more digits than its factorization.

122028128645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10837 (or 5421 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

Adding to 122028128645 its reverse (546821820221), we get a palindrome (668849948866).

The spelling of 122028128645 in words is "one hundred twenty-two billion, twenty-eight million, one hundred twenty-eight thousand, six hundred forty-five".