27771641549 has 2 divisors, whose sum is σ = 27771641550. Its totient is φ = 27771641548.

The previous prime is 27771641539. The next prime is 27771641591. The reversal of 27771641549 is 94514617772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18283907524 + 9487734025 = 135218^2 + 97405^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771641549 - 2¹⁶ = 27771576013 is a prime.

It is a super-2 number, since 2×27771641549² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27771641549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771641539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885820774 + 13885820775.

It is an arithmetic number, because the mean of its divisors is an integer number (13885820775).

Almost surely, 2^27771641549 is an apocalyptic number.

It is an amenable number.

27771641549 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771641549 is an equidigital number, since it uses as much as digits as its factorization.

27771641549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 53.

The spelling of 27771641549 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty-one thousand, five hundred forty-nine".