66543222 has 16 divisors (see below), whose sum is σ = 133329600. Its totient is φ = 22140552.

The previous prime is 66543221. The next prime is 66543227. The reversal of 66543222 is 22234566.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66543222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66543221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6472 + ... + 13227.

It is an arithmetic number, because the mean of its divisors is an integer number (8333100).

Almost surely, 2^66543222 is an apocalyptic number.

66543222 is an abundant number, since it is smaller than the sum of its proper divisors (66786378).

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

66543222 is a wasteful number, since it uses less digits than its factorization.

66543222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20267.

The product of its digits is 17280, while the sum is 30.

The square root of 66543222 is about 8157.4028955299. The cubic root of 66543222 is about 405.2297066062.

Adding to 66543222 its reverse (22234566), we get a palindrome (88777788).

The spelling of 66543222 in words is "sixty-six million, five hundred forty-three thousand, two hundred twenty-two".