2164944473 has 4 divisors (see below), whose sum is σ = 2200435428. Its totient is φ = 2129453520.

The previous prime is 2164944421. The next prime is 2164944479. The reversal of 2164944473 is 3744494612.

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 855445504 + 1309498969 = 29248^2 + 36187^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164944473 - 2⁸ = 2164944217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164944479) 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 3 ways as a sum of consecutive naturals, for example, 17745386 + ... + 17745507.

It is an arithmetic number, because the mean of its divisors is an integer number (550108857).

Almost surely, 2^2164944473 is an apocalyptic number.

It is an amenable number.

2164944473 is a deficient number, since it is larger than the sum of its proper divisors (35490955).

2164944473 is an equidigital number, since it uses as much as digits as its factorization.

2164944473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35490954.

The product of its digits is 580608, while the sum is 44.

The square root of 2164944473 is about 46528.9638075038. The cubic root of 2164944473 is about 1293.6464090378.

The spelling of 2164944473 in words is "two billion, one hundred sixty-four million, nine hundred forty-four thousand, four hundred seventy-three".