127866669409 has 2 divisors, whose sum is σ = 127866669410. Its totient is φ = 127866669408.

The previous prime is 127866669367. The next prime is 127866669419. The reversal of 127866669409 is 904966668721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96935709025 + 30930960384 = 311345^2 + 175872^2 .

It is an emirp because it is prime and its reverse (904966668721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127866669409 - 2²⁷ = 127732451681 is a prime.

It is not a weakly prime, because it can be changed into another prime (127866669419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63933334704 + 63933334705.

It is an arithmetic number, because the mean of its divisors is an integer number (63933334705).

Almost surely, 2^127866669409 is an apocalyptic number.

It is an amenable number.

127866669409 is a deficient number, since it is larger than the sum of its proper divisors (1).

127866669409 is an equidigital number, since it uses as much as digits as its factorization.

127866669409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 127866669409 in words is "one hundred twenty-seven billion, eight hundred sixty-six million, six hundred sixty-nine thousand, four hundred nine".