1666366727 has 2 divisors, whose sum is σ = 1666366728. Its totient is φ = 1666366726.

The previous prime is 1666366711. The next prime is 1666366729. The reversal of 1666366727 is 7276636661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666366727 - 2⁴ = 1666366711 is a prime.

Together with 1666366729, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666366729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833183363 + 833183364.

It is an arithmetic number, because the mean of its divisors is an integer number (833183364).

Almost surely, 2^1666366727 is an apocalyptic number.

1666366727 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666366727 is an equidigital number, since it uses as much as digits as its factorization.

1666366727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 50.

The square root of 1666366727 is about 40821.1553854126. The cubic root of 1666366727 is about 1185.5599736702.

The spelling of 1666366727 in words is "one billion, six hundred sixty-six million, three hundred sixty-six thousand, seven hundred twenty-seven".