128753763865 has 8 divisors (see below), whose sum is σ = 154577650248. Its totient is φ = 102954255360.

The previous prime is 128753763863. The next prime is 128753763871. The reversal of 128753763865 is 568367357821.

It can be written as a sum of positive squares in 4 ways, for example, as 687121369 + 128066642496 = 26213^2 + 357864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128753763865 - 2¹ = 128753763863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128753763863) 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 in 7 ways as a sum of consecutive naturals, for example, 6082846 + ... + 6103975.

It is an arithmetic number, because the mean of its divisors is an integer number (19322206281).

Almost surely, 2^128753763865 is an apocalyptic number.

It is an amenable number.

128753763865 is a deficient number, since it is larger than the sum of its proper divisors (25823886383).

128753763865 is a wasteful number, since it uses less digits than its factorization.

128753763865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188939.

The product of its digits is 50803200, while the sum is 61.

The spelling of 128753763865 in words is "one hundred twenty-eight billion, seven hundred fifty-three million, seven hundred sixty-three thousand, eight hundred sixty-five".