6664815 has 16 divisors (see below), whose sum is σ = 11848800. Its totient is φ = 3554496.

The previous prime is 6664811. The next prime is 6664831. The reversal of 6664815 is 5184666.

It is not a de Polignac number, because 6664815 - 2² = 6664811 is a prime.

6664815 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6664815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24550 + ... + 24819.

It is an arithmetic number, because the mean of its divisors is an integer number (740550).

Almost surely, 2^6664815 is an apocalyptic number.

6664815 is a deficient number, since it is larger than the sum of its proper divisors (5183985).

6664815 is a wasteful number, since it uses less digits than its factorization.

6664815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49383 (or 49377 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6664815 is about 2581.6302988616. The cubic root of 6664815 is about 188.1897793122.

The spelling of 6664815 in words is "six million, six hundred sixty-four thousand, eight hundred fifteen".