6634720709 has 2 divisors, whose sum is σ = 6634720710. Its totient is φ = 6634720708.

The previous prime is 6634720681. The next prime is 6634720721. The reversal of 6634720709 is 9070274366.

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., 3548584900 + 3086135809 = 59570^2 + 55553^2 .

It is a cyclic number.

It is not a de Polignac number, because 6634720709 - 2¹⁶ = 6634655173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6634720709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6634720909) 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, 3317360354 + 3317360355.

It is an arithmetic number, because the mean of its divisors is an integer number (3317360355).

Almost surely, 2^6634720709 is an apocalyptic number.

It is an amenable number.

6634720709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6634720709 is an equidigital number, since it uses as much as digits as its factorization.

6634720709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 6634720709 is about 81453.7949330785. The cubic root of 6634720709 is about 1879.0610133793.

The spelling of 6634720709 in words is "six billion, six hundred thirty-four million, seven hundred twenty thousand, seven hundred nine".