9166665709849 has 2 divisors, whose sum is σ = 9166665709850. Its totient is φ = 9166665709848.

The previous prime is 9166665709837. The next prime is 9166665709891. The reversal of 9166665709849 is 9489075666619.

9166665709849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9142416991449 + 24248718400 = 3023643^2 + 155720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9166665709849 is a prime.

It is a super-2 number, since 2×9166665709849² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9166665709549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4583332854924 + 4583332854925.

It is an arithmetic number, because the mean of its divisors is an integer number (4583332854925).

Almost surely, 2^{9166665709849} is an apocalyptic number.

It is an amenable number.

9166665709849 is a deficient number, since it is larger than the sum of its proper divisors (1).

9166665709849 is an equidigital number, since it uses as much as digits as its factorization.

9166665709849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058158080, while the sum is 76.

The spelling of 9166665709849 in words is "nine trillion, one hundred sixty-six billion, six hundred sixty-five million, seven hundred nine thousand, eight hundred forty-nine".