2164856173 has 4 divisors (see below), whose sum is σ = 2165271388. Its totient is φ = 2164440960.

The previous prime is 2164856171. The next prime is 2164856189. The reversal of 2164856173 is 3716584612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101243844 + 2063612329 = 10062^2 + 45427^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164856173 - 2¹ = 2164856171 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 (2164856171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199686 + ... + 210247.

It is an arithmetic number, because the mean of its divisors is an integer number (541317847).

Almost surely, 2^2164856173 is an apocalyptic number.

It is an amenable number.

2164856173 is a deficient number, since it is larger than the sum of its proper divisors (415215).

2164856173 is an equidigital number, since it uses as much as digits as its factorization.

2164856173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415214.

The product of its digits is 241920, while the sum is 43.

The square root of 2164856173 is about 46528.0149264935. The cubic root of 2164856173 is about 1293.6288211301.

The spelling of 2164856173 in words is "two billion, one hundred sixty-four million, eight hundred fifty-six thousand, one hundred seventy-three".