127828516681 has 2 divisors, whose sum is σ = 127828516682. Its totient is φ = 127828516680.

The previous prime is 127828516679. The next prime is 127828516733. The reversal of 127828516681 is 186615828721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126835699600 + 992817081 = 356140^2 + 31509^2 .

It is a cyclic number.

It is not a de Polignac number, because 127828516681 - 2¹ = 127828516679 is a prime.

It is a super-2 number, since 2×127828516681² (a number of 23 digits) contains 22 as substring.

Together with 127828516679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (127828516661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63914258340 + 63914258341.

It is an arithmetic number, because the mean of its divisors is an integer number (63914258341).

Almost surely, 2^127828516681 is an apocalyptic number.

It is an amenable number.

127828516681 is a deficient number, since it is larger than the sum of its proper divisors (1).

127828516681 is an equidigital number, since it uses as much as digits as its factorization.

127828516681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 55.

The spelling of 127828516681 in words is "one hundred twenty-seven billion, eight hundred twenty-eight million, five hundred sixteen thousand, six hundred eighty-one".