6645222 has 24 divisors (see below), whose sum is σ = 14863680. Its totient is φ = 2143440.

The previous prime is 6645217. The next prime is 6645227. The reversal of 6645222 is 2225466.

It is an interprime number because it is at equal distance from previous prime (6645217) and next prime (6645227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645227) 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 11 ways as a sum of consecutive naturals, for example, 5397 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (619320).

Almost surely, 2^6645222 is an apocalyptic number.

6645222 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

6645222 is an abundant number, since it is smaller than the sum of its proper divisors (8218458).

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

6645222 is a wasteful number, since it uses less digits than its factorization.

6645222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11948 (or 11945 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 6645222 is about 2577.8328107152. The cubic root of 6645222 is about 188.0051869702.

It can be divided in two parts, 664 and 5222, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 6645222 in words is "six million, six hundred forty-five thousand, two hundred twenty-two".