27758443666777 has 2 divisors, whose sum is σ = 27758443666778. Its totient is φ = 27758443666776.

The previous prime is 27758443666727. The next prime is 27758443666787. The reversal of 27758443666777 is 77766634485772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23268236048656 + 4490207618121 = 4823716^2 + 2119011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27758443666777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27758443666697 and 27758443666706.

It is not a weakly prime, because it can be changed into another prime (27758443666727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13879221833388 + 13879221833389.

It is an arithmetic number, because the mean of its divisors is an integer number (13879221833389).

Almost surely, 2^{27758443666777} is an apocalyptic number.

It is an amenable number.

27758443666777 is a deficient number, since it is larger than the sum of its proper divisors (1).

27758443666777 is an equidigital number, since it uses as much as digits as its factorization.

27758443666777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13940398080, while the sum is 79.

The spelling of 27758443666777 in words is "twenty-seven trillion, seven hundred fifty-eight billion, four hundred forty-three million, six hundred sixty-six thousand, seven hundred seventy-seven".