127945686857 has 4 divisors (see below), whose sum is σ = 127949812500. Its totient is φ = 127941561216.

The previous prime is 127945686833. The next prime is 127945686859. The reversal of 127945686857 is 758686549721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758686549721 = 23 ⋅32986371727.

It can be written as a sum of positive squares in 2 ways, for example, as 89174501641 + 38771185216 = 298621^2 + 196904^2 .

It is a cyclic number.

It is not a de Polignac number, because 127945686857 - 2⁸ = 127945686601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127945686859) 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 3 ways as a sum of consecutive naturals, for example, 2015948 + ... + 2078445.

It is an arithmetic number, because the mean of its divisors is an integer number (31987453125).

Almost surely, 2^127945686857 is an apocalyptic number.

It is an amenable number.

127945686857 is a deficient number, since it is larger than the sum of its proper divisors (4125643).

127945686857 is an equidigital number, since it uses as much as digits as its factorization.

127945686857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4125642.

The product of its digits is 203212800, while the sum is 68.

The spelling of 127945686857 in words is "one hundred twenty-seven billion, nine hundred forty-five million, six hundred eighty-six thousand, eight hundred fifty-seven".