6607908745661 has 2 divisors, whose sum is σ = 6607908745662. Its totient is φ = 6607908745660.

The previous prime is 6607908745649. The next prime is 6607908745679. The reversal of 6607908745661 is 1665478097066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6344605322500 + 263303423161 = 2518850^2 + 513131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6607908745661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6607908745861) 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, 3303954372830 + 3303954372831.

It is an arithmetic number, because the mean of its divisors is an integer number (3303954372831).

Almost surely, 2^{6607908745661} is an apocalyptic number.

It is an amenable number.

6607908745661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6607908745661 is an equidigital number, since it uses as much as digits as its factorization.

6607908745661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 65.

The spelling of 6607908745661 in words is "six trillion, six hundred seven billion, nine hundred eight million, seven hundred forty-five thousand, six hundred sixty-one".