55216222 has 8 divisors (see below), whose sum is σ = 83282472. Its totient is φ = 27455400.

The previous prime is 55216201. The next prime is 55216229. The reversal of 55216222 is 22261255.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55216229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75904 + ... + 76627.

It is an arithmetic number, because the mean of its divisors is an integer number (10410309).

Almost surely, 2^55216222 is an apocalyptic number.

55216222 is a deficient number, since it is larger than the sum of its proper divisors (28066250).

55216222 is a wasteful number, since it uses less digits than its factorization.

55216222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152714.

The product of its digits is 2400, while the sum is 25.

The square root of 55216222 is about 7430.7618721098. The cubic root of 55216222 is about 380.7929471586.

Adding to 55216222 its reverse (22261255), we get a palindrome (77477477).

The spelling of 55216222 in words is "fifty-five million, two hundred sixteen thousand, two hundred twenty-two".