8366138865 has 64 divisors (see below), whose sum is σ = 17207877120. Its totient is φ = 3824485632.

The previous prime is 8366138861. The next prime is 8366138873. The reversal of 8366138865 is 5688316638.

It is not a de Polignac number, because 8366138865 - 2² = 8366138861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8366138861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21897 + ... + 131193.

It is an arithmetic number, because the mean of its divisors is an integer number (268873080).

Almost surely, 2^8366138865 is an apocalyptic number.

It is an amenable number.

8366138865 is an abundant number, since it is smaller than the sum of its proper divisors (8841738255).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8366138865 is an equidigital number, since it uses as much as digits as its factorization.

8366138865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109330 (or 109312 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 8366138865 is about 91466.5997236150. The cubic root of 8366138865 is about 2030.0575800439.

The spelling of 8366138865 in words is "eight billion, three hundred sixty-six million, one hundred thirty-eight thousand, eight hundred sixty-five".