1666445233 has 8 divisors (see below), whose sum is σ = 1671134976. Its totient is φ = 1661763600.

The previous prime is 1666445219. The next prime is 1666445237. The reversal of 1666445233 is 3325446661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666445233 - 2⁵ = 1666445201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666445237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698703 + ... + 701083.

It is an arithmetic number, because the mean of its divisors is an integer number (208891872).

Almost surely, 2^1666445233 is an apocalyptic number.

It is an amenable number.

1666445233 is a deficient number, since it is larger than the sum of its proper divisors (4689743).

1666445233 is an equidigital number, since it uses as much as digits as its factorization.

1666445233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055.

The product of its digits is 311040, while the sum is 40.

The square root of 1666445233 is about 40822.1169588252. The cubic root of 1666445233 is about 1185.5785914427.

The spelling of 1666445233 in words is "one billion, six hundred sixty-six million, four hundred forty-five thousand, two hundred thirty-three".