16656222 has 32 divisors (see below), whose sum is σ = 37192320. Its totient is φ = 4929120.

The previous prime is 16656203. The next prime is 16656223. The reversal of 16656222 is 22265661.

It is a self number, because there is not a number n which added to its sum of digits gives 16656222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656223) 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, 97 + ... + 5772.

It is an arithmetic number, because the mean of its divisors is an integer number (1162260).

Almost surely, 2^16656222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16656222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18596160).

16656222 is an abundant number, since it is smaller than the sum of its proper divisors (20536098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16656222 is a wasteful number, since it uses less digits than its factorization.

16656222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5928.

The product of its digits is 8640, while the sum is 30.

The square root of 16656222 is about 4081.2034989694. The cubic root of 16656222 is about 255.3831073371.

It can be divided in two parts, 1665 and 6222, that added together give a palindrome (7887).

The spelling of 16656222 in words is "sixteen million, six hundred fifty-six thousand, two hundred twenty-two".