66555222 has 8 divisors (see below), whose sum is σ = 133110456. Its totient is φ = 22185072.

The previous prime is 66555199. The next prime is 66555241. The reversal of 66555222 is 22255566.

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

66555222 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5546263 + ... + 5546274.

It is an arithmetic number, because the mean of its divisors is an integer number (16638807).

Almost surely, 2^66555222 is an apocalyptic number.

66555222 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.

66555222 is a wasteful number, since it uses less digits than its factorization.

66555222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11092542.

The product of its digits is 36000, while the sum is 33.

The square root of 66555222 is about 8158.1383905889. The cubic root of 66555222 is about 405.2540640291.

The spelling of 66555222 in words is "sixty-six million, five hundred fifty-five thousand, two hundred twenty-two".