1664221199 has 2 divisors, whose sum is σ = 1664221200. Its totient is φ = 1664221198.

The previous prime is 1664221159. The next prime is 1664221213. The reversal of 1664221199 is 9911224661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1664221199 - 2²⁴ = 1647443983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832110599 + 832110600.

It is an arithmetic number, because the mean of its divisors is an integer number (832110600).

Almost surely, 2^1664221199 is an apocalyptic number.

1664221199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664221199 is an equidigital number, since it uses as much as digits as its factorization.

1664221199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 1664221199 is about 40794.8673119548. The cubic root of 1664221199 is about 1185.0509331428.

The spelling of 1664221199 in words is "one billion, six hundred sixty-four million, two hundred twenty-one thousand, one hundred ninety-nine".