1666810327 has 18 divisors (see below), whose sum is σ = 2064469848. Its totient is φ = 1317683952.

The previous prime is 1666810307. The next prime is 1666810331. The reversal of 1666810327 is 7230186661.

It is a happy number.

It is not a de Polignac number, because 1666810327 - 2²⁷ = 1532592599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666810327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666810307) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1403628 + ... + 1404814.

Almost surely, 2^1666810327 is an apocalyptic number.

1666810327 is a deficient number, since it is larger than the sum of its proper divisors (397659521).

1666810327 is an frugal number, since it uses more digits than its factorization.

1666810327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407 (or 1207 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1666810327 is about 40826.5884810377. The cubic root of 1666810327 is about 1185.6651661498.

Adding to 1666810327 its reverse (7230186661), we get a palindrome (8896996988).

The spelling of 1666810327 in words is "one billion, six hundred sixty-six million, eight hundred ten thousand, three hundred twenty-seven".