8665938109 has 2 divisors, whose sum is σ = 8665938110. Its totient is φ = 8665938108.

The previous prime is 8665938103. The next prime is 8665938163. The reversal of 8665938109 is 9018395668.

8665938109 = T₇₆₀₀₇ + T₇₆₀₀₈ + T₇₆₀₀₉.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5806897209 + 2859040900 = 76203^2 + 53470^2 .

It is a cyclic number.

It is not a de Polignac number, because 8665938109 - 2¹³ = 8665929917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8665938109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8665938103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332969054 + 4332969055.

It is an arithmetic number, because the mean of its divisors is an integer number (4332969055).

Almost surely, 2^8665938109 is an apocalyptic number.

8665938109 is the 76009-th centered triangular number.

It is an amenable number.

8665938109 is a deficient number, since it is larger than the sum of its proper divisors (1).

8665938109 is an equidigital number, since it uses as much as digits as its factorization.

8665938109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 8665938109 is about 93091.0205605245. The cubic root of 8665938109 is about 2054.0224893380.

The spelling of 8665938109 in words is "eight billion, six hundred sixty-five million, nine hundred thirty-eight thousand, one hundred nine".