27688126537 has 2 divisors, whose sum is σ = 27688126538. Its totient is φ = 27688126536.

The previous prime is 27688126489. The next prime is 27688126573. The reversal of 27688126537 is 73562188672.

Together with next prime (27688126573) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20157184576 + 7530941961 = 141976^2 + 86781^2 .

It is a cyclic number.

It is not a de Polignac number, because 27688126537 - 2¹¹ = 27688124489 is a prime.

It is a super-2 number, since 2×27688126537² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27688126577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13844063268 + 13844063269.

It is an arithmetic number, because the mean of its divisors is an integer number (13844063269).

Almost surely, 2^27688126537 is an apocalyptic number.

It is an amenable number.

27688126537 is a deficient number, since it is larger than the sum of its proper divisors (1).

27688126537 is an equidigital number, since it uses as much as digits as its factorization.

27688126537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 55.

The spelling of 27688126537 in words is "twenty-seven billion, six hundred eighty-eight million, one hundred twenty-six thousand, five hundred thirty-seven".