66222210 has 32 divisors (see below), whose sum is σ = 161543232. Its totient is φ = 17369280.

The previous prime is 66222209. The next prime is 66222227. The reversal of 66222210 is 1222266.

66222210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16264 + ... + 19923.

It is an arithmetic number, because the mean of its divisors is an integer number (5048226).

Almost surely, 2^66222210 is an apocalyptic number.

66222210 is an abundant number, since it is smaller than the sum of its proper divisors (95321022).

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

66222210 is a wasteful number, since it uses less digits than its factorization.

66222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36258.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 66222210 is about 8137.7029928598. The cubic root of 66222210 is about 404.5770313655.

Adding to 66222210 its product of nonzero digits (576), we get a triangular number (66222786 = T₁₁₅₀₈).

Adding to 66222210 its reverse (1222266), we get a palindrome (67444476).

The spelling of 66222210 in words is "sixty-six million, two hundred twenty-two thousand, two hundred ten".