27081651557 has 2 divisors, whose sum is σ = 27081651558. Its totient is φ = 27081651556.

The previous prime is 27081651469. The next prime is 27081651587. The reversal of 27081651557 is 75515618072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25934203681 + 1147447876 = 161041^2 + 33874^2 .

It is a cyclic number.

It is not a de Polignac number, because 27081651557 - 2¹⁴ = 27081635173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27081651587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13540825778 + 13540825779.

It is an arithmetic number, because the mean of its divisors is an integer number (13540825779).

Almost surely, 2^27081651557 is an apocalyptic number.

It is an amenable number.

27081651557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27081651557 is an equidigital number, since it uses as much as digits as its factorization.

27081651557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588000, while the sum is 47.

The spelling of 27081651557 in words is "twenty-seven billion, eighty-one million, six hundred fifty-one thousand, five hundred fifty-seven".