1643222216 has 16 divisors (see below), whose sum is σ = 3133263600. Its totient is φ = 807685264.

The previous prime is 1643222183. The next prime is 1643222221. The reversal of 1643222216 is 6122223461.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1740230 + ... + 1741173.

It is an arithmetic number, because the mean of its divisors is an integer number (195828975).

Almost surely, 2^1643222216 is an apocalyptic number.

It is an amenable number.

1643222216 is a deficient number, since it is larger than the sum of its proper divisors (1490041384).

1643222216 is a wasteful number, since it uses less digits than its factorization.

1643222216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481468 (or 3481464 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 1643222216 is about 40536.6774168777. The cubic root of 1643222216 is about 1180.0455349660.

Adding to 1643222216 its reverse (6122223461), we get a palindrome (7765445677).

The spelling of 1643222216 in words is "one billion, six hundred forty-three million, two hundred twenty-two thousand, two hundred sixteen".