19666027 has 2 divisors, whose sum is σ = 19666028. Its totient is φ = 19666026.

The previous prime is 19665967. The next prime is 19666037. The reversal of 19666027 is 72066691.

It is a strong prime.

It is an emirp because it is prime and its reverse (72066691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19666027 - 2¹¹ = 19663979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19666037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9833013 + 9833014.

It is an arithmetic number, because the mean of its divisors is an integer number (9833014).

Almost surely, 2^19666027 is an apocalyptic number.

19666027 is a deficient number, since it is larger than the sum of its proper divisors (1).

19666027 is an equidigital number, since it uses as much as digits as its factorization.

19666027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 19666027 is about 4434.6394441939. The cubic root of 19666027 is about 269.9223690853.

The spelling of 19666027 in words is "nineteen million, six hundred sixty-six thousand, twenty-seven".