6665221319 has 2 divisors, whose sum is σ = 6665221320. Its totient is φ = 6665221318.

The previous prime is 6665221301. The next prime is 6665221349. The reversal of 6665221319 is 9131225666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665221319 is a prime.

It is a super-2 number, since 2×6665221319² = 88850350462504199522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665221349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332610659 + 3332610660.

It is an arithmetic number, because the mean of its divisors is an integer number (3332610660).

Almost surely, 2^6665221319 is an apocalyptic number.

6665221319 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665221319 is an equidigital number, since it uses as much as digits as its factorization.

6665221319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 6665221319 is about 81640.8067022858. The cubic root of 6665221319 is about 1881.9360355088.

The spelling of 6665221319 in words is "six billion, six hundred sixty-five million, two hundred twenty-one thousand, three hundred nineteen".