1666323227 has 2 divisors, whose sum is σ = 1666323228. Its totient is φ = 1666323226.

The previous prime is 1666323223. The next prime is 1666323257. The reversal of 1666323227 is 7223236661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666323227 - 2² = 1666323223 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666323223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833161613 + 833161614.

It is an arithmetic number, because the mean of its divisors is an integer number (833161614).

Almost surely, 2^1666323227 is an apocalyptic number.

1666323227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666323227 is an equidigital number, since it uses as much as digits as its factorization.

1666323227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The square root of 1666323227 is about 40820.6225699707. The cubic root of 1666323227 is about 1185.5496573521.

Adding to 1666323227 its reverse (7223236661), we get a palindrome (8889559888).

The spelling of 1666323227 in words is "one billion, six hundred sixty-six million, three hundred twenty-three thousand, two hundred twenty-seven".