6665816 has 16 divisors (see below), whose sum is σ = 12531240. Its totient is φ = 3324160.

The previous prime is 6665803. The next prime is 6665831. The reversal of 6665816 is 6185666.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6665816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080 + ... + 4776.

Almost surely, 2^6665816 is an apocalyptic number.

It is an amenable number.

6665816 is a deficient number, since it is larger than the sum of its proper divisors (5865424).

6665816 is a wasteful number, since it uses less digits than its factorization.

6665816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194 (or 2190 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 6665816 is about 2581.8241613247. The cubic root of 6665816 is about 188.1992003559.

The spelling of 6665816 in words is "six million, six hundred sixty-five thousand, eight hundred sixteen".