66543211 has 16 divisors (see below), whose sum is σ = 78068736. Its totient is φ = 55535616.

The previous prime is 66543203. The next prime is 66543221. The reversal of 66543211 is 11234566.

It is a cyclic number.

It is not a de Polignac number, because 66543211 - 2³ = 66543203 is a prime.

It is a Duffinian number.

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 66543211.

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 15 ways as a sum of consecutive naturals, for example, 84160 + ... + 84946.

It is an arithmetic number, because the mean of its divisors is an integer number (4879296).

Almost surely, 2^66543211 is an apocalyptic number.

66543211 is a deficient number, since it is larger than the sum of its proper divisors (11525525).

66543211 is a wasteful number, since it uses less digits than its factorization.

66543211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its digits is 4320, while the sum is 28.

The square root of 66543211 is about 8157.4022212957. The cubic root of 66543211 is about 405.2296842772.

Adding to 66543211 its reverse (11234566), we get a palindrome (77777777).

The spelling of 66543211 in words is "sixty-six million, five hundred forty-three thousand, two hundred eleven".