127957666609 has 2 divisors, whose sum is σ = 127957666610. Its totient is φ = 127957666608.

The previous prime is 127957666579. The next prime is 127957666633. The reversal of 127957666609 is 906666759721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94327608384 + 33630058225 = 307128^2 + 183385^2 .

It is a cyclic number.

It is not a de Polignac number, because 127957666609 - 2⁹ = 127957666097 is a prime.

It is not a weakly prime, because it can be changed into another prime (127957667609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63978833304 + 63978833305.

It is an arithmetic number, because the mean of its divisors is an integer number (63978833305).

Almost surely, 2^127957666609 is an apocalyptic number.

It is an amenable number.

127957666609 is a deficient number, since it is larger than the sum of its proper divisors (1).

127957666609 is an equidigital number, since it uses as much as digits as its factorization.

127957666609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51438240, while the sum is 64.

The spelling of 127957666609 in words is "one hundred twenty-seven billion, nine hundred fifty-seven million, six hundred sixty-six thousand, six hundred nine".