664422222 has 16 divisors (see below), whose sum is σ = 1329524352. Its totient is φ = 221360760.

The previous prime is 664422211. The next prime is 664422223. The reversal of 664422222 is 222224466.

664422222 is a modest number, since divided by 22222 gives 6644 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 664422222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664422223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15154 + ... + 39477.

It is an arithmetic number, because the mean of its divisors is an integer number (83095272).

Almost surely, 2^664422222 is an apocalyptic number.

664422222 is an abundant number, since it is smaller than the sum of its proper divisors (665102130).

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

664422222 is a wasteful number, since it uses less digits than its factorization.

664422222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56663.

The product of its digits is 18432, while the sum is 30.

The square root of 664422222 is about 25776.3888471601. The cubic root of 664422222 is about 872.5990109941.

Adding to 664422222 its reverse (222224466), we get a palindrome (886646688).

The spelling of 664422222 in words is "six hundred sixty-four million, four hundred twenty-two thousand, two hundred twenty-two".