6669666 has 12 divisors (see below), whose sum is σ = 14450982. Its totient is φ = 2223216.

The previous prime is 6669653. The next prime is 6669671.

6669666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 5659641 + 1010025 = 2379^2 + 1005^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 185251 + ... + 185286.

Almost surely, 2^6669666 is an apocalyptic number.

6669666 is an abundant number, since it is smaller than the sum of its proper divisors (7781316).

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

6669666 is a wasteful number, since it uses less digits than its factorization.

6669666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370545 (or 370542 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 6669666 is about 2582.5696505612. The cubic root of 6669666 is about 188.2354263518.

The spelling of 6669666 in words is "six million, six hundred sixty-nine thousand, six hundred sixty-six".