2161568855 has 16 divisors (see below), whose sum is σ = 2663621184. Its totient is φ = 1683348480.

The previous prime is 2161568813. The next prime is 2161568867. The reversal of 2161568855 is 5588651612.

2161568855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161568855 - 2⁶ = 2161568791 is a prime.

It is a super-2 number, since 2×2161568855² = 9344759829812022050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6947 + ... + 66116.

It is an arithmetic number, because the mean of its divisors is an integer number (166476324).

Almost surely, 2^2161568855 is an apocalyptic number.

2161568855 is a deficient number, since it is larger than the sum of its proper divisors (502052329).

2161568855 is an equidigital number, since it uses as much as digits as its factorization.

2161568855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73226.

The product of its digits is 576000, while the sum is 47.

The square root of 2161568855 is about 46492.6752833175. The cubic root of 2161568855 is about 1292.9737008380.

The spelling of 2161568855 in words is "two billion, one hundred sixty-one million, five hundred sixty-eight thousand, eight hundred fifty-five".