27727331557 has 2 divisors, whose sum is σ = 27727331558. Its totient is φ = 27727331556.

The previous prime is 27727331531. The next prime is 27727331561. The reversal of 27727331557 is 75513372772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27122466721 + 604864836 = 164689^2 + 24594^2 .

It is a cyclic number.

It is not a de Polignac number, because 27727331557 - 2²³ = 27718942949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27727331557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27727331057) 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, 13863665778 + 13863665779.

It is an arithmetic number, because the mean of its divisors is an integer number (13863665779).

Almost surely, 2^27727331557 is an apocalyptic number.

It is an amenable number.

27727331557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27727331557 is an equidigital number, since it uses as much as digits as its factorization.

27727331557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160900, while the sum is 49.

The spelling of 27727331557 in words is "twenty-seven billion, seven hundred twenty-seven million, three hundred thirty-one thousand, five hundred fifty-seven".