66123222 has 32 divisors (see below), whose sum is σ = 144595584. Its totient is φ = 19992000.

The previous prime is 66123209. The next prime is 66123257. The reversal of 66123222 is 22232166.

It is a super-2 number, since 2×66123222² = 8744560975322568, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 66123192 and 66123201.

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 15 ways as a sum of consecutive naturals, for example, 38833 + ... + 40499.

It is an arithmetic number, because the mean of its divisors is an integer number (4518612).

Almost surely, 2^66123222 is an apocalyptic number.

66123222 is an abundant number, since it is smaller than the sum of its proper divisors (78472362).

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

66123222 is a wasteful number, since it uses less digits than its factorization.

66123222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its digits is 1728, while the sum is 24.

The square root of 66123222 is about 8131.6186580533. The cubic root of 66123222 is about 404.3753455449.

Adding to 66123222 its reverse (22232166), we get a palindrome (88355388).

The spelling of 66123222 in words is "sixty-six million, one hundred twenty-three thousand, two hundred twenty-two".