127925709517 has 2 divisors, whose sum is σ = 127925709518. Its totient is φ = 127925709516.

The previous prime is 127925709503. The next prime is 127925709589. The reversal of 127925709517 is 715907529721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122759837641 + 5165871876 = 350371^2 + 71874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127925709517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127925709017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63962854758 + 63962854759.

It is an arithmetic number, because the mean of its divisors is an integer number (63962854759).

Almost surely, 2^127925709517 is an apocalyptic number.

It is an amenable number.

127925709517 is a deficient number, since it is larger than the sum of its proper divisors (1).

127925709517 is an equidigital number, since it uses as much as digits as its factorization.

127925709517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2778300, while the sum is 55.

The spelling of 127925709517 in words is "one hundred twenty-seven billion, nine hundred twenty-five million, seven hundred nine thousand, five hundred seventeen".