2220816173 has 4 divisors (see below), whose sum is σ = 2221385340. Its totient is φ = 2220247008.

The previous prime is 2220816149. The next prime is 2220816187. The reversal of 2220816173 is 3716180222.

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 195636169 + 2025180004 = 13987^2 + 45002^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220816173 - 2⁸ = 2220815917 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 (2220816113) 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, 278690 + ... + 286547.

It is an arithmetic number, because the mean of its divisors is an integer number (555346335).

Almost surely, 2^2220816173 is an apocalyptic number.

It is an amenable number.

2220816173 is a deficient number, since it is larger than the sum of its proper divisors (569167).

2220816173 is an equidigital number, since it uses as much as digits as its factorization.

2220816173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569166.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 2220816173 is about 47125.5363152506. The cubic root of 2220816173 is about 1304.6805974922.

Adding to 2220816173 its reverse (3716180222), we get a palindrome (5936996395).

The spelling of 2220816173 in words is "two billion, two hundred twenty million, eight hundred sixteen thousand, one hundred seventy-three".