6645646 has 16 divisors (see below), whose sum is σ = 11427840. Its totient is φ = 2839320.

The previous prime is 6645641. The next prime is 6645677. The reversal of 6645646 is 6465466.

It is a super-2 number, since 2×6645646² = 88329221514632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645641) 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 7 ways as a sum of consecutive naturals, for example, 6211 + ... + 7201.

It is an arithmetic number, because the mean of its divisors is an integer number (714240).

Almost surely, 2^6645646 is an apocalyptic number.

6645646 is a deficient number, since it is larger than the sum of its proper divisors (4782194).

6645646 is a wasteful number, since it uses less digits than its factorization.

6645646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479.

The product of its digits is 103680, while the sum is 37.

The square root of 6645646 is about 2577.9150490270. The cubic root of 6645646 is about 188.0091854573.

The spelling of 6645646 in words is "six million, six hundred forty-five thousand, six hundred forty-six".