127577715509 has 2 divisors, whose sum is σ = 127577715510. Its totient is φ = 127577715508.

The previous prime is 127577715481. The next prime is 127577715511. The reversal of 127577715509 is 905517775721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119256262225 + 8321453284 = 345335^2 + 91222^2 .

It is a cyclic number.

It is not a de Polignac number, because 127577715509 - 2¹⁶ = 127577649973 is a prime.

Together with 127577715511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127577715539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63788857754 + 63788857755.

It is an arithmetic number, because the mean of its divisors is an integer number (63788857755).

Almost surely, 2^127577715509 is an apocalyptic number.

It is an amenable number.

127577715509 is a deficient number, since it is larger than the sum of its proper divisors (1).

127577715509 is an equidigital number, since it uses as much as digits as its factorization.

127577715509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5402250, while the sum is 56.

The spelling of 127577715509 in words is "one hundred twenty-seven billion, five hundred seventy-seven million, seven hundred fifteen thousand, five hundred nine".