66226212 has 36 divisors (see below), whose sum is σ = 180283740. Its totient is φ = 20377152.

The previous prime is 66226207. The next prime is 66226231. The reversal of 66226212 is 21262266.

It can be written as a sum of positive squares in 2 ways, for example, as 22982436 + 43243776 = 4794^2 + 6576^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66226212² = 8771822311737888, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70287 + ... + 71222.

Almost surely, 2^66226212 is an apocalyptic number.

It is an amenable number.

66226212 is an abundant number, since it is smaller than the sum of its proper divisors (114057528).

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

66226212 is a wasteful number, since it uses less digits than its factorization.

66226212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141532 (or 141527 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 66226212 is about 8137.9488816286. The cubic root of 66226212 is about 404.5851811220.

Adding to 66226212 its reverse (21262266), we get a palindrome (87488478).

The spelling of 66226212 in words is "sixty-six million, two hundred twenty-six thousand, two hundred twelve".