6660660019 has 4 divisors (see below), whose sum is σ = 7173018496. Its totient is φ = 6148301544.

The previous prime is 6660660011. The next prime is 6660660047. The reversal of 6660660019 is 9100660666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6660660019 - 2³ = 6660660011 is a prime.

It is a super-2 number, since 2×6660660019² = 88728783777410160722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660660011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256179219 + ... + 256179244.

It is an arithmetic number, because the mean of its divisors is an integer number (1793254624).

Almost surely, 2^6660660019 is an apocalyptic number.

6660660019 is a deficient number, since it is larger than the sum of its proper divisors (512358477).

6660660019 is a wasteful number, since it uses less digits than its factorization.

6660660019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512358476.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 6660660019 is about 81612.8667490611. The cubic root of 6660660019 is about 1881.5066407283.

The spelling of 6660660019 in words is "six billion, six hundred sixty million, six hundred sixty thousand, nineteen".