27517936681 has 2 divisors, whose sum is σ = 27517936682. Its totient is φ = 27517936680.

The previous prime is 27517936673. The next prime is 27517936717. The reversal of 27517936681 is 18663971572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26328307600 + 1189629081 = 162260^2 + 34491^2 .

It is a cyclic number.

It is not a de Polignac number, because 27517936681 - 2³ = 27517936673 is a prime.

It is a super-2 number, since 2×27517936681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27517936651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13758968340 + 13758968341.

It is an arithmetic number, because the mean of its divisors is an integer number (13758968341).

Almost surely, 2^27517936681 is an apocalyptic number.

It is an amenable number.

27517936681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27517936681 is an equidigital number, since it uses as much as digits as its factorization.

27517936681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 55.

The spelling of 27517936681 in words is "twenty-seven billion, five hundred seventeen million, nine hundred thirty-six thousand, six hundred eighty-one".