99666709 has 2 divisors, whose sum is σ = 99666710. Its totient is φ = 99666708.

The previous prime is 99666667. The next prime is 99666731. The reversal of 99666709 is 90766699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97950609 + 1716100 = 9897^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 99666709 - 2¹¹ = 99664661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99666109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49833354 + 49833355.

It is an arithmetic number, because the mean of its divisors is an integer number (49833355).

Almost surely, 2^99666709 is an apocalyptic number.

It is an amenable number.

99666709 is a deficient number, since it is larger than the sum of its proper divisors (1).

99666709 is an equidigital number, since it uses as much as digits as its factorization.

99666709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 99666709 is about 9983.3215414510. The cubic root of 99666709 is about 463.6426428134.

The spelling of 99666709 in words is "ninety-nine million, six hundred sixty-six thousand, seven hundred nine".