1666666233 has 16 divisors (see below), whose sum is σ = 2487988800. Its totient is φ = 1102626720.

The previous prime is 1666666207. The next prime is 1666666259. The reversal of 1666666233 is 3326666661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666666207) and next prime (1666666259).

It is not a de Polignac number, because 1666666233 - 2²² = 1662471929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666666033) 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 15 ways as a sum of consecutive naturals, for example, 232068 + ... + 239141.

It is an arithmetic number, because the mean of its divisors is an integer number (155499300).

Almost surely, 2^1666666233 is an apocalyptic number.

It is an amenable number.

1666666233 is a deficient number, since it is larger than the sum of its proper divisors (821322567).

1666666233 is a wasteful number, since it uses less digits than its factorization.

1666666233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471349 (or 471343 counting only the distinct ones).

The product of its digits is 839808, while the sum is 45.

The square root of 1666666233 is about 40824.8237350757. The cubic root of 1666666233 is about 1185.6309986629.

The spelling of 1666666233 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, two hundred thirty-three".