127646376509 has 2 divisors, whose sum is σ = 127646376510. Its totient is φ = 127646376508.

The previous prime is 127646376491. The next prime is 127646376563. The reversal of 127646376509 is 905673646721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107188795609 + 20457580900 = 327397^2 + 143030^2 .

It is a cyclic number.

It is not a de Polignac number, because 127646376509 - 2²⁰ = 127645327933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127646336509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63823188254 + 63823188255.

It is an arithmetic number, because the mean of its divisors is an integer number (63823188255).

Almost surely, 2^127646376509 is an apocalyptic number.

It is an amenable number.

127646376509 is a deficient number, since it is larger than the sum of its proper divisors (1).

127646376509 is an equidigital number, since it uses as much as digits as its factorization.

127646376509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 127646376509 in words is "one hundred twenty-seven billion, six hundred forty-six million, three hundred seventy-six thousand, five hundred nine".