6660815 has 24 divisors (see below), whose sum is σ = 9608832. Its totient is φ = 4415040.

The previous prime is 6660809. The next prime is 6660859. The reversal of 6660815 is 5180666.

It is not a de Polignac number, because 6660815 - 2⁴ = 6660799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7157 + ... + 8033.

It is an arithmetic number, because the mean of its divisors is an integer number (400368).

Almost surely, 2^6660815 is an apocalyptic number.

6660815 is a deficient number, since it is larger than the sum of its proper divisors (2948017).

6660815 is a wasteful number, since it uses less digits than its factorization.

6660815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6660815 is about 2580.8554783250. The cubic root of 6660815 is about 188.1521233652.

The spelling of 6660815 in words is "six million, six hundred sixty thousand, eight hundred fifteen".