27660491387 has 2 divisors, whose sum is σ = 27660491388. Its totient is φ = 27660491386.

The previous prime is 27660491329. The next prime is 27660491407. The reversal of 27660491387 is 78319406672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27660491387 - 2³⁴ = 10480622203 is a prime.

It is not a weakly prime, because it can be changed into another prime (27660493387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830245693 + 13830245694.

It is an arithmetic number, because the mean of its divisors is an integer number (13830245694).

Almost surely, 2^27660491387 is an apocalyptic number.

27660491387 is a deficient number, since it is larger than the sum of its proper divisors (1).

27660491387 is an equidigital number, since it uses as much as digits as its factorization.

27660491387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 27660491387 in words is "twenty-seven billion, six hundred sixty million, four hundred ninety-one thousand, three hundred eighty-seven".