2116685809 has 8 divisors (see below), whose sum is σ = 2419357248. Its totient is φ = 1814086320.

The previous prime is 2116685777. The next prime is 2116685849. The reversal of 2116685809 is 9085866112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2116685809 - 2⁵ = 2116685777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2116685849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82494 + ... + 105064.

It is an arithmetic number, because the mean of its divisors is an integer number (302419656).

Almost surely, 2^2116685809 is an apocalyptic number.

It is an amenable number.

2116685809 is a deficient number, since it is larger than the sum of its proper divisors (302671439).

2116685809 is a wasteful number, since it uses less digits than its factorization.

2116685809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35975.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 2116685809 is about 46007.4538417418. The cubic root of 2116685809 is about 1283.9618880278.

The spelling of 2116685809 in words is "two billion, one hundred sixteen million, six hundred eighty-five thousand, eight hundred nine".