2216705765 has 8 divisors (see below), whose sum is σ = 2676990840. Its totient is φ = 1762068672.

The previous prime is 2216705723. The next prime is 2216705767. The reversal of 2216705765 is 5675076122.

It can be written as a sum of positive squares in 4 ways, for example, as 35628961 + 2181076804 = 5969^2 + 46702^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2216705765 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216705767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1411130 + ... + 1412699.

It is an arithmetic number, because the mean of its divisors is an integer number (334623855).

Almost surely, 2^2216705765 is an apocalyptic number.

It is an amenable number.

2216705765 is a deficient number, since it is larger than the sum of its proper divisors (460285075).

2216705765 is a wasteful number, since it uses less digits than its factorization.

2216705765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823991.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 2216705765 is about 47081.9048573866. The cubic root of 2216705765 is about 1303.8751756528.

The spelling of 2216705765 in words is "two billion, two hundred sixteen million, seven hundred five thousand, seven hundred sixty-five".