127663765538 has 16 divisors (see below), whose sum is σ = 194639385336. Its totient is φ = 62788659840.

The previous prime is 127663765513. The next prime is 127663765589. The reversal of 127663765538 is 835567366721.

127663765538 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 124225936849 + 3437828689 = 352457^2 + 58633^2 .

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 1117673 + ... + 1226588.

Almost surely, 2^127663765538 is an apocalyptic number.

127663765538 is a deficient number, since it is larger than the sum of its proper divisors (66975619798).

127663765538 is a wasteful number, since it uses less digits than its factorization.

127663765538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344709.

The product of its digits is 38102400, while the sum is 59.

The spelling of 127663765538 in words is "one hundred twenty-seven billion, six hundred sixty-three million, seven hundred sixty-five thousand, five hundred thirty-eight".