127980000809 has 2 divisors, whose sum is σ = 127980000810. Its totient is φ = 127980000808.

The previous prime is 127980000779. The next prime is 127980000857. The reversal of 127980000809 is 908000089721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93394416025 + 34585584784 = 305605^2 + 185972^2 .

It is an emirp because it is prime and its reverse (908000089721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127980000809 - 2²⁸ = 127711565353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127980000809.

It is not a weakly prime, because it can be changed into another prime (127980000409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63990000404 + 63990000405.

It is an arithmetic number, because the mean of its divisors is an integer number (63990000405).

Almost surely, 2^127980000809 is an apocalyptic number.

It is an amenable number.

127980000809 is a deficient number, since it is larger than the sum of its proper divisors (1).

127980000809 is an equidigital number, since it uses as much as digits as its factorization.

127980000809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 127980000809 in words is "one hundred twenty-seven billion, nine hundred eighty million, eight hundred nine", and thus it is an aban number.