6669879217 has 2 divisors, whose sum is σ = 6669879218. Its totient is φ = 6669879216.

The previous prime is 6669879179. The next prime is 6669879239. The reversal of 6669879217 is 7129789666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5074995121 + 1594884096 = 71239^2 + 39936^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669879217 - 2¹¹ = 6669877169 is a prime.

It is not a weakly prime, because it can be changed into another prime (6669879317) 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, 3334939608 + 3334939609.

It is an arithmetic number, because the mean of its divisors is an integer number (3334939609).

Almost surely, 2^6669879217 is an apocalyptic number.

It is an amenable number.

6669879217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669879217 is an equidigital number, since it uses as much as digits as its factorization.

6669879217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The square root of 6669879217 is about 81669.3284960762. The cubic root of 6669879217 is about 1882.3743217762.

The spelling of 6669879217 in words is "six billion, six hundred sixty-nine million, eight hundred seventy-nine thousand, two hundred seventeen".