866136109 has 12 divisors (see below), whose sum is σ = 915350976. Its totient is φ = 819447048.

The previous prime is 866136097. The next prime is 866136137. The reversal of 866136109 is 901631668.

It is not a de Polignac number, because 866136109 - 2⁹ = 866135597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866136149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418812 + ... + 420874.

It is an arithmetic number, because the mean of its divisors is an integer number (76279248).

Almost surely, 2^866136109 is an apocalyptic number.

It is an amenable number.

866136109 is a deficient number, since it is larger than the sum of its proper divisors (49214867).

866136109 is a wasteful number, since it uses less digits than its factorization.

866136109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3245 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 866136109 is about 29430.1904343142. The cubic root of 866136109 is about 953.2249068851.

The spelling of 866136109 in words is "eight hundred sixty-six million, one hundred thirty-six thousand, one hundred nine".