2165728663 has 8 divisors (see below), whose sum is σ = 2476380032. Its totient is φ = 1855392696.

The previous prime is 2165728633. The next prime is 2165728679. The reversal of 2165728663 is 3668275612.

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 2165728663 - 2⁹ = 2165728151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165728633) 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, 63945 + ... + 91762.

It is an arithmetic number, because the mean of its divisors is an integer number (309547504).

Almost surely, 2^2165728663 is an apocalyptic number.

2165728663 is a deficient number, since it is larger than the sum of its proper divisors (310651369).

2165728663 is a wasteful number, since it uses less digits than its factorization.

2165728663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157701.

The product of its digits is 725760, while the sum is 46.

The square root of 2165728663 is about 46537.3899461498. The cubic root of 2165728663 is about 1293.8025858094.

The spelling of 2165728663 in words is "two billion, one hundred sixty-five million, seven hundred twenty-eight thousand, six hundred sixty-three".