646406111222 has 4 divisors (see below), whose sum is σ = 969609166836. Its totient is φ = 323203055610.

The previous prime is 646406111203. The next prime is 646406111227. The reversal of 646406111222 is 222111604646.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646406111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161601527804 + ... + 161601527807.

It is an arithmetic number, because the mean of its divisors is an integer number (242402291709).

Almost surely, 2^646406111222 is an apocalyptic number.

646406111222 is a deficient number, since it is larger than the sum of its proper divisors (323203055614).

646406111222 is a wasteful number, since it uses less digits than its factorization.

646406111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323203055613.

The product of its (nonzero) digits is 27648, while the sum is 35.

Adding to 646406111222 its reverse (222111604646), we get a palindrome (868517715868).

The spelling of 646406111222 in words is "six hundred forty-six billion, four hundred six million, one hundred eleven thousand, two hundred twenty-two".