1665506027 has 2 divisors, whose sum is σ = 1665506028. Its totient is φ = 1665506026.

The previous prime is 1665505993. The next prime is 1665506041. The reversal of 1665506027 is 7206055661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1665506027 - 2¹⁸ = 1665243883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665500027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832753013 + 832753014.

It is an arithmetic number, because the mean of its divisors is an integer number (832753014).

Almost surely, 2^1665506027 is an apocalyptic number.

1665506027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665506027 is an equidigital number, since it uses as much as digits as its factorization.

1665506027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1665506027 is about 40810.6116959793. The cubic root of 1665506027 is about 1185.3558194889.

The spelling of 1665506027 in words is "one billion, six hundred sixty-five million, five hundred six thousand, twenty-seven".