6660751709 has 2 divisors, whose sum is σ = 6660751710. Its totient is φ = 6660751708.

The previous prime is 6660751633. The next prime is 6660751717. The reversal of 6660751709 is 9071570666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4508719609 + 2152032100 = 67147^2 + 46390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660751709 is a prime.

It is a super-2 number, since 2×6660751709² = 88731226657892841362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660756709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330375854 + 3330375855.

It is an arithmetic number, because the mean of its divisors is an integer number (3330375855).

Almost surely, 2^6660751709 is an apocalyptic number.

It is an amenable number.

6660751709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660751709 is an equidigital number, since it uses as much as digits as its factorization.

6660751709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 6660751709 is about 81613.4284845331. The cubic root of 6660751709 is about 1881.5152742347.

The spelling of 6660751709 in words is "six billion, six hundred sixty million, seven hundred fifty-one thousand, seven hundred nine".