6666603641 has 2 divisors, whose sum is σ = 6666603642. Its totient is φ = 6666603640.

The previous prime is 6666603637. The next prime is 6666603683. The reversal of 6666603641 is 1463066666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4135004416 + 2531599225 = 64304^2 + 50315^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666603641 - 2² = 6666603637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6666603592 and 6666603601.

It is not a weakly prime, because it can be changed into another prime (6666603611) 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, 3333301820 + 3333301821.

It is an arithmetic number, because the mean of its divisors is an integer number (3333301821).

Almost surely, 2^6666603641 is an apocalyptic number.

It is an amenable number.

6666603641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666603641 is an equidigital number, since it uses as much as digits as its factorization.

6666603641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 44.

The square root of 6666603641 is about 81649.2721400503. The cubic root of 6666603641 is about 1882.0661268011.

The spelling of 6666603641 in words is "six billion, six hundred sixty-six million, six hundred three thousand, six hundred forty-one".