127770881209 has 2 divisors, whose sum is σ = 127770881210. Its totient is φ = 127770881208.

The previous prime is 127770881207. The next prime is 127770881291. The reversal of 127770881209 is 902188077721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87391184400 + 40379696809 = 295620^2 + 200947^2 .

It is a cyclic number.

It is not a de Polignac number, because 127770881209 - 2¹ = 127770881207 is a prime.

Together with 127770881207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (127770881207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63885440604 + 63885440605.

It is an arithmetic number, because the mean of its divisors is an integer number (63885440605).

Almost surely, 2^127770881209 is an apocalyptic number.

It is an amenable number.

127770881209 is a deficient number, since it is larger than the sum of its proper divisors (1).

127770881209 is an equidigital number, since it uses as much as digits as its factorization.

127770881209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 52.

The spelling of 127770881209 in words is "one hundred twenty-seven billion, seven hundred seventy million, eight hundred eighty-one thousand, two hundred nine".