127945686809 has 2 divisors, whose sum is σ = 127945686810. Its totient is φ = 127945686808.

The previous prime is 127945686761. The next prime is 127945686829. The reversal of 127945686809 is 908686549721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64039363600 + 63906323209 = 253060^2 + 252797^2 .

It is a cyclic number.

It is not a de Polignac number, because 127945686809 - 2⁸ = 127945686553 is a prime.

It is not a weakly prime, because it can be changed into another prime (127945686829) 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 as a sum of consecutive naturals, namely, 63972843404 + 63972843405.

It is an arithmetic number, because the mean of its divisors is an integer number (63972843405).

Almost surely, 2^127945686809 is an apocalyptic number.

It is an amenable number.

127945686809 is a deficient number, since it is larger than the sum of its proper divisors (1).

127945686809 is an equidigital number, since it uses as much as digits as its factorization.

127945686809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 127945686809 in words is "one hundred twenty-seven billion, nine hundred forty-five million, six hundred eighty-six thousand, eight hundred nine".