1666232443 has 2 divisors, whose sum is σ = 1666232444. Its totient is φ = 1666232442.

The previous prime is 1666232411. The next prime is 1666232453. The reversal of 1666232443 is 3442326661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666232443 - 2⁵ = 1666232411 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666232453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833116221 + 833116222.

It is an arithmetic number, because the mean of its divisors is an integer number (833116222).

Almost surely, 2^1666232443 is an apocalyptic number.

1666232443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666232443 is an equidigital number, since it uses as much as digits as its factorization.

1666232443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 37.

The square root of 1666232443 is about 40819.5105678645. The cubic root of 1666232443 is about 1185.5281267365.

The spelling of 1666232443 in words is "one billion, six hundred sixty-six million, two hundred thirty-two thousand, four hundred forty-three".