222161616 has 200 divisors, whose sum is σ = 682471944. Its totient is φ = 69672960.

The previous prime is 222161591. The next prime is 222161617. The reversal of 222161616 is 616161222.

222161616 is a `hidden beast` number, since 22 + 21 + 6 + 1 + 616 = 666.

222161616 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 4 ways, for example, as 32400 + 222129216 = 180^2 + 14904^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 222161616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222161617) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1965976 + ... + 1966088.

Almost surely, 2^222161616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222161616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341235972).

222161616 is an abundant number, since it is smaller than the sum of its proper divisors (460310328).

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

222161616 is a wasteful number, since it uses less digits than its factorization.

222161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 196 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 222161616 is about 14905.0869168885. The cubic root of 222161616 is about 605.6517948635.

It can be divided in two parts, 22216 and 1616, that added together give a palindrome (23832).

The spelling of 222161616 in words is "two hundred twenty-two million, one hundred sixty-one thousand, six hundred sixteen".