27777668497 has 2 divisors, whose sum is σ = 27777668498. Its totient is φ = 27777668496.

The previous prime is 27777668467. The next prime is 27777668539. The reversal of 27777668497 is 79486677772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27582898561 + 194769936 = 166081^2 + 13956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27777668497 is a prime.

It is not a weakly prime, because it can be changed into another prime (27777668467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888834248 + 13888834249.

It is an arithmetic number, because the mean of its divisors is an integer number (13888834249).

Almost surely, 2^27777668497 is an apocalyptic number.

It is an amenable number.

27777668497 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777668497 is an equidigital number, since it uses as much as digits as its factorization.

27777668497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 348509952, while the sum is 70.

The spelling of 27777668497 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-eight thousand, four hundred ninety-seven".