6669945 has 40 divisors (see below), whose sum is σ = 12266496. Its totient is φ = 3465504.

The previous prime is 6669907. The next prime is 6669947. The reversal of 6669945 is 5499666.

It is not a de Polignac number, because 6669945 - 2⁶ = 6669881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6669945.

It is not an unprimeable number, because it can be changed into a prime (6669947) 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 39 ways as a sum of consecutive naturals, for example, 17224 + ... + 17606.

Almost surely, 2^6669945 is an apocalyptic number.

It is an amenable number.

6669945 is a deficient number, since it is larger than the sum of its proper divisors (5596551).

6669945 is a wasteful number, since it uses less digits than its factorization.

6669945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 434 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 6669945 is about 2582.6236659645. The cubic root of 6669945 is about 188.2380510185.

The spelling of 6669945 in words is "six million, six hundred sixty-nine thousand, nine hundred forty-five".