127561636481 has 2 divisors, whose sum is σ = 127561636482. Its totient is φ = 127561636480.

The previous prime is 127561636333. The next prime is 127561636483. The reversal of 127561636481 is 184636165721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89092698256 + 38468938225 = 298484^2 + 196135^2 .

It is a cyclic number.

It is not a de Polignac number, because 127561636481 - 2¹⁰ = 127561635457 is a prime.

It is a super-2 number, since 2×127561636481² (a number of 23 digits) contains 22 as substring.

Together with 127561636483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127561636483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63780818240 + 63780818241.

It is an arithmetic number, because the mean of its divisors is an integer number (63780818241).

Almost surely, 2^127561636481 is an apocalyptic number.

It is an amenable number.

127561636481 is a deficient number, since it is larger than the sum of its proper divisors (1).

127561636481 is an equidigital number, since it uses as much as digits as its factorization.

127561636481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The spelling of 127561636481 in words is "one hundred twenty-seven billion, five hundred sixty-one million, six hundred thirty-six thousand, four hundred eighty-one".