646220223 has 18 divisors (see below), whose sum is σ = 1026002432. Its totient is φ = 391647960.

The previous prime is 646220173. The next prime is 646220227. The reversal of 646220223 is 322022646.

646220223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646220223 - 2⁹ = 646219711 is a prime.

It is a super-2 number, since 2×646220223² = 835201153228339458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646220227) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 295615 + ... + 297792.

Almost surely, 2^646220223 is an apocalyptic number.

646220223 is a deficient number, since it is larger than the sum of its proper divisors (379782209).

646220223 is a wasteful number, since it uses less digits than its factorization.

646220223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593435 (or 593421 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 646220223 is about 25420.8619641428. The cubic root of 646220223 is about 864.5567680343.

Adding to 646220223 its reverse (322022646), we get a palindrome (968242869).

The spelling of 646220223 in words is "six hundred forty-six million, two hundred twenty thousand, two hundred twenty-three".