6645966 has 16 divisors (see below), whose sum is σ = 13721088. Its totient is φ = 2143800.

The previous prime is 6645949. The next prime is 6645971. The reversal of 6645966 is 6695466.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17680 + ... + 18051.

It is an arithmetic number, because the mean of its divisors is an integer number (857568).

Almost surely, 2^6645966 is an apocalyptic number.

6645966 is an abundant number, since it is smaller than the sum of its proper divisors (7075122).

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

6645966 is a wasteful number, since it uses less digits than its factorization.

6645966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35767.

The product of its digits is 233280, while the sum is 42.

The square root of 6645966 is about 2577.9771139403. The cubic root of 6645966 is about 188.0122030709.

The spelling of 6645966 in words is "six million, six hundred forty-five thousand, nine hundred sixty-six".