6666673213 has 2 divisors, whose sum is σ = 6666673214. Its totient is φ = 6666673212.

The previous prime is 6666673183. The next prime is 6666673219. The reversal of 6666673213 is 3123766666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5389468569 + 1277204644 = 73413^2 + 35738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666673213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666673219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333336606 + 3333336607.

It is an arithmetic number, because the mean of its divisors is an integer number (3333336607).

Almost surely, 2^6666673213 is an apocalyptic number.

It is an amenable number.

6666673213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666673213 is an equidigital number, since it uses as much as digits as its factorization.

6666673213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 46.

The square root of 6666673213 is about 81649.6981807036. The cubic root of 6666673213 is about 1882.0726737954.

The spelling of 6666673213 in words is "six billion, six hundred sixty-six million, six hundred seventy-three thousand, two hundred thirteen".