2159568865 has 8 divisors (see below), whose sum is σ = 2592571968. Its totient is φ = 1726928880.

The previous prime is 2159568847. The next prime is 2159568889. The reversal of 2159568865 is 5688659512.

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

It is not a de Polignac number, because 2159568865 - 2⁹ = 2159568353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77517 + ... + 101626.

It is an arithmetic number, because the mean of its divisors is an integer number (324071496).

Almost surely, 2^2159568865 is an apocalyptic number.

It is an amenable number.

2159568865 is a deficient number, since it is larger than the sum of its proper divisors (433003103).

2159568865 is a wasteful number, since it uses less digits than its factorization.

2159568865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181559.

The product of its digits is 5184000, while the sum is 55.

The square root of 2159568865 is about 46471.1616489194. The cubic root of 2159568865 is about 1292.5748034630.

The spelling of 2159568865 in words is "two billion, one hundred fifty-nine million, five hundred sixty-eight thousand, eight hundred sixty-five".