66642222 has 8 divisors (see below), whose sum is σ = 133284456. Its totient is φ = 22214072.

The previous prime is 66642197. The next prime is 66642259. The reversal of 66642222 is 22224666.

It is a sphenic number, since it is the product of 3 distinct primes.

66642222 is an admirable 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 66642222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553513 + ... + 5553524.

It is an arithmetic number, because the mean of its divisors is an integer number (16660557).

Almost surely, 2^66642222 is an apocalyptic number.

66642222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66642222 is a wasteful number, since it uses less digits than its factorization.

66642222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107042.

The product of its digits is 13824, while the sum is 30.

The square root of 66642222 is about 8163.4687480262. The cubic root of 66642222 is about 405.4305678462.

Adding to 66642222 its reverse (22224666), we get a palindrome (88866888).

The spelling of 66642222 in words is "sixty-six million, six hundred forty-two thousand, two hundred twenty-two".