127706415721 has 2 divisors, whose sum is σ = 127706415722. Its totient is φ = 127706415720.

The previous prime is 127706415701. The next prime is 127706415731. The reversal of 127706415721 is 127514607721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102745891600 + 24960524121 = 320540^2 + 157989^2 .

It is a cyclic number.

It is not a de Polignac number, because 127706415721 - 2²⁵ = 127672861289 is a prime.

It is not a weakly prime, because it can be changed into another prime (127706415701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63853207860 + 63853207861.

It is an arithmetic number, because the mean of its divisors is an integer number (63853207861).

Almost surely, 2^127706415721 is an apocalyptic number.

It is an amenable number.

127706415721 is a deficient number, since it is larger than the sum of its proper divisors (1).

127706415721 is an equidigital number, since it uses as much as digits as its factorization.

127706415721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 127706415721 in words is "one hundred twenty-seven billion, seven hundred six million, four hundred fifteen thousand, seven hundred twenty-one".