127944257869849 has 2 divisors, whose sum is σ = 127944257869850. Its totient is φ = 127944257869848.

The previous prime is 127944257869811. The next prime is 127944257870003. The reversal of 127944257869849 is 948968752449721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99634334890000 + 28309922979849 = 9981700^2 + 5320707^2 .

It is a cyclic number.

It is not a de Polignac number, because 127944257869849 - 2²³ = 127944249481241 is a prime.

It is not a weakly prime, because it can be changed into another prime (127944257819849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63972128934924 + 63972128934925.

It is an arithmetic number, because the mean of its divisors is an integer number (63972128934925).

Almost surely, 2^{127944257869849} is an apocalyptic number.

It is an amenable number.

127944257869849 is a deficient number, since it is larger than the sum of its proper divisors (1).

127944257869849 is an equidigital number, since it uses as much as digits as its factorization.

127944257869849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17557585920, while the sum is 85.

The spelling of 127944257869849 in words is "one hundred twenty-seven trillion, nine hundred forty-four billion, two hundred fifty-seven million, eight hundred sixty-nine thousand, eight hundred forty-nine".