55122222 has 8 divisors (see below), whose sum is σ = 110244456. Its totient is φ = 18374072.

The previous prime is 55122217. The next prime is 55122241. The reversal of 55122222 is 22222155.

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

55122222 is an admirable number.

It is a congruent number.

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, 4593513 + ... + 4593524.

It is an arithmetic number, because the mean of its divisors is an integer number (13780557).

Almost surely, 2^55122222 is an apocalyptic number.

55122222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55122222 is a wasteful number, since it uses less digits than its factorization.

55122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9187042.

The product of its digits is 800, while the sum is 21.

The square root of 55122222 is about 7424.4341198505. The cubic root of 55122222 is about 380.5767373374.

Adding to 55122222 its reverse (22222155), we get a palindrome (77344377).

The spelling of 55122222 in words is "fifty-five million, one hundred twenty-two thousand, two hundred twenty-two".