27771248669 has 2 divisors, whose sum is σ = 27771248670. Its totient is φ = 27771248668.

The previous prime is 27771248651. The next prime is 27771248737. The reversal of 27771248669 is 96684217772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27759891769 + 11356900 = 166613^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771248669 - 2²⁰ = 27770200093 is a prime.

It is a super-2 number, since 2×27771248669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771248969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885624334 + 13885624335.

It is an arithmetic number, because the mean of its divisors is an integer number (13885624335).

Almost surely, 2^27771248669 is an apocalyptic number.

It is an amenable number.

27771248669 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771248669 is an equidigital number, since it uses as much as digits as its factorization.

27771248669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 59.

The spelling of 27771248669 in words is "twenty-seven billion, seven hundred seventy-one million, two hundred forty-eight thousand, six hundred sixty-nine".