127768905757 has 4 divisors (see below), whose sum is σ = 127774389600. Its totient is φ = 127763421916.

The previous prime is 127768905751. The next prime is 127768905793. The reversal of 127768905757 is 757509867721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 757509867721 = 474211 ⋅1597411.

It is a cyclic number.

It is not a de Polignac number, because 127768905757 - 2³ = 127768905749 is a prime.

It is a super-2 number, since 2×127768905757² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127768905751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2706823 + ... + 2753620.

It is an arithmetic number, because the mean of its divisors is an integer number (31943597400).

Almost surely, 2^127768905757 is an apocalyptic number.

It is an amenable number.

127768905757 is a deficient number, since it is larger than the sum of its proper divisors (5483843).

127768905757 is an equidigital number, since it uses as much as digits as its factorization.

127768905757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483842.

The product of its (nonzero) digits is 51861600, while the sum is 64.

The spelling of 127768905757 in words is "one hundred twenty-seven billion, seven hundred sixty-eight million, nine hundred five thousand, seven hundred fifty-seven".