16642222 has 4 divisors (see below), whose sum is σ = 24963336. Its totient is φ = 8321110.

The previous prime is 16642217. The next prime is 16642231. The reversal of 16642222 is 22224661.

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

16642222 is a modest number, since divided by 2222 gives 1664 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160554 + ... + 4160557.

It is an arithmetic number, because the mean of its divisors is an integer number (6240834).

Almost surely, 2^16642222 is an apocalyptic number.

16642222 is a deficient number, since it is larger than the sum of its proper divisors (8321114).

16642222 is an equidigital number, since it uses as much as digits as its factorization.

16642222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8321113.

The product of its digits is 2304, while the sum is 25.

The square root of 16642222 is about 4079.4879580653. The cubic root of 16642222 is about 255.3115351702.

Adding to 16642222 its reverse (22224661), we get a palindrome (38866883).

The spelling of 16642222 in words is "sixteen million, six hundred forty-two thousand, two hundred twenty-two".