2218180172 has 48 divisors (see below), whose sum is σ = 4231906560. Its totient is φ = 1011250752.

The previous prime is 2218180157. The next prime is 2218180177. The reversal of 2218180172 is 2710818122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2218180177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1553723 + ... + 1555149.

It is an arithmetic number, because the mean of its divisors is an integer number (88164720).

Almost surely, 2^2218180172 is an apocalyptic number.

It is an amenable number.

2218180172 is a deficient number, since it is larger than the sum of its proper divisors (2013726388).

2218180172 is a wasteful number, since it uses less digits than its factorization.

2218180172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 1788 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 2218180172 is about 47097.5601491203. The cubic root of 2218180172 is about 1304.1641956100.

Adding to 2218180172 its reverse (2710818122), we get a palindrome (4928998294).

The spelling of 2218180172 in words is "two billion, two hundred eighteen million, one hundred eighty thousand, one hundred seventy-two".