6666458819 has 2 divisors, whose sum is σ = 6666458820. Its totient is φ = 6666458818.

The previous prime is 6666458801. The next prime is 6666458867. The reversal of 6666458819 is 9188546666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6666458819 - 2²⁴ = 6649681603 is a prime.

It is a super-2 number, since 2×6666458819² = 88883346370845749522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6666458899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333229409 + 3333229410.

It is an arithmetic number, because the mean of its divisors is an integer number (3333229410).

Almost surely, 2^6666458819 is an apocalyptic number.

6666458819 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666458819 is an equidigital number, since it uses as much as digits as its factorization.

6666458819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 59.

The square root of 6666458819 is about 81648.3852810330. The cubic root of 6666458819 is about 1882.0524983445.

The spelling of 6666458819 in words is "six billion, six hundred sixty-six million, four hundred fifty-eight thousand, eight hundred nineteen".