27727138427 has 2 divisors, whose sum is σ = 27727138428. Its totient is φ = 27727138426.

The previous prime is 27727138391. The next prime is 27727138469. The reversal of 27727138427 is 72483172772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27727138427 - 2⁸ = 27727138171 is a prime.

It is not a weakly prime, because it can be changed into another prime (27727138487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13863569213 + 13863569214.

It is an arithmetic number, because the mean of its divisors is an integer number (13863569214).

Almost surely, 2^27727138427 is an apocalyptic number.

27727138427 is a deficient number, since it is larger than the sum of its proper divisors (1).

27727138427 is an equidigital number, since it uses as much as digits as its factorization.

27727138427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1843968, while the sum is 50.

The spelling of 27727138427 in words is "twenty-seven billion, seven hundred twenty-seven million, one hundred thirty-eight thousand, four hundred twenty-seven".