6666644473 has 2 divisors, whose sum is σ = 6666644474. Its totient is φ = 6666644472.

The previous prime is 6666644431. The next prime is 6666644533. The reversal of 6666644473 is 3744466666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6665579449 + 1065024 = 81643^2 + 1032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666644473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666644473.

It is not a weakly prime, because it can be changed into another prime (6666644573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333322236 + 3333322237.

It is an arithmetic number, because the mean of its divisors is an integer number (3333322237).

Almost surely, 2^6666644473 is an apocalyptic number.

It is an amenable number.

6666644473 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666644473 is an equidigital number, since it uses as much as digits as its factorization.

6666644473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 52.

The square root of 6666644473 is about 81649.5221847624. The cubic root of 6666644473 is about 1882.0699692557.

The spelling of 6666644473 in words is "six billion, six hundred sixty-six million, six hundred forty-four thousand, four hundred seventy-three".