646332223 has 4 divisors (see below), whose sum is σ = 674433648. Its totient is φ = 618230800.

The previous prime is 646332209. The next prime is 646332233. The reversal of 646332223 is 322233646.

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

It is not a de Polignac number, because 646332223 - 2¹⁷ = 646201151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646332233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14050678 + ... + 14050723.

It is an arithmetic number, because the mean of its divisors is an integer number (168608412).

Almost surely, 2^646332223 is an apocalyptic number.

646332223 is a deficient number, since it is larger than the sum of its proper divisors (28101425).

646332223 is a wasteful number, since it uses less digits than its factorization.

646332223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28101424.

The product of its digits is 31104, while the sum is 31.

The square root of 646332223 is about 25423.0647837746. The cubic root of 646332223 is about 864.6067121870.

Adding to 646332223 its reverse (322233646), we get a palindrome (968565869).

The spelling of 646332223 in words is "six hundred forty-six million, three hundred thirty-two thousand, two hundred twenty-three".