2165996687 has 8 divisors (see below), whose sum is σ = 2321257056. Its totient is φ = 2015826912.

The previous prime is 2165996681. The next prime is 2165996737. The reversal of 2165996687 is 7866995612.

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 2165996687 - 2⁴ = 2165996671 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 (2165996681) 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, 1271768 + ... + 1273469.

It is an arithmetic number, because the mean of its divisors is an integer number (290157132).

Almost surely, 2^2165996687 is an apocalyptic number.

2165996687 is a deficient number, since it is larger than the sum of its proper divisors (155260369).

2165996687 is a wasteful number, since it uses less digits than its factorization.

2165996687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545297.

The product of its digits is 9797760, while the sum is 59.

The square root of 2165996687 is about 46540.2695200619. The cubic root of 2165996687 is about 1293.8559559670.

The spelling of 2165996687 in words is "two billion, one hundred sixty-five million, nine hundred ninety-six thousand, six hundred eighty-seven".