422643666 has 8 divisors (see below), whose sum is σ = 845287344. Its totient is φ = 140881220.

The previous prime is 422643643. The next prime is 422643667. The reversal of 422643666 is 666346224.

It is a happy number.

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

422643666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (422643667) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35220300 + ... + 35220311.

It is an arithmetic number, because the mean of its divisors is an integer number (105660918).

Almost surely, 2^422643666 is an apocalyptic number.

422643666 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.

422643666 is a wasteful number, since it uses less digits than its factorization.

422643666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70440616.

The product of its digits is 248832, while the sum is 39.

The square root of 422643666 is about 20558.2992000798. The cubic root of 422643666 is about 750.4552294101.

The spelling of 422643666 in words is "four hundred twenty-two million, six hundred forty-three thousand, six hundred sixty-six".