127149921617 has 2 divisors, whose sum is σ = 127149921618. Its totient is φ = 127149921616.

The previous prime is 127149921599. The next prime is 127149921629. The reversal of 127149921617 is 716129941721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113795576896 + 13354344721 = 337336^2 + 115561^2 .

It is a cyclic number.

It is not a de Polignac number, because 127149921617 - 2¹⁶ = 127149856081 is a prime.

It is not a weakly prime, because it can be changed into another prime (127149929617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63574960808 + 63574960809.

It is an arithmetic number, because the mean of its divisors is an integer number (63574960809).

Almost surely, 2^127149921617 is an apocalyptic number.

It is an amenable number.

127149921617 is a deficient number, since it is larger than the sum of its proper divisors (1).

127149921617 is an equidigital number, since it uses as much as digits as its factorization.

127149921617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 50.

The spelling of 127149921617 in words is "one hundred twenty-seven billion, one hundred forty-nine million, nine hundred twenty-one thousand, six hundred seventeen".