6664540219 has 2 divisors, whose sum is σ = 6664540220. Its totient is φ = 6664540218.

The previous prime is 6664540213. The next prime is 6664540273. The reversal of 6664540219 is 9120454666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664540219 - 2²⁵ = 6630985787 is a prime.

It is a super-2 number, since 2×6664540219² = 88832192661337135922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6664540213) 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, 3332270109 + 3332270110.

It is an arithmetic number, because the mean of its divisors is an integer number (3332270110).

Almost surely, 2^6664540219 is an apocalyptic number.

6664540219 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664540219 is an equidigital number, since it uses as much as digits as its factorization.

6664540219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 6664540219 is about 81636.6352748568. The cubic root of 6664540219 is about 1881.8719300957.

The spelling of 6664540219 in words is "six billion, six hundred sixty-four million, five hundred forty thousand, two hundred nineteen".