128753763866 has 48 divisors (see below), whose sum is σ = 242149547304. Its totient is φ = 50892258816.

The previous prime is 128753763863. The next prime is 128753763871. The reversal of 128753763866 is 668367357821.

It can be written as a sum of positive squares in 4 ways, for example, as 106932270025 + 21821493841 = 327005^2 + 147721^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128753763799 and 128753763808.

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 23 ways as a sum of consecutive naturals, for example, 1477526 + ... + 1562238.

Almost surely, 2^128753763866 is an apocalyptic number.

128753763866 is a deficient number, since it is larger than the sum of its proper divisors (113395783438).

128753763866 is a wasteful number, since it uses less digits than its factorization.

128753763866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85935 (or 85928 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 62.

The spelling of 128753763866 in words is "one hundred twenty-eight billion, seven hundred fifty-three million, seven hundred sixty-three thousand, eight hundred sixty-six".