6663879 has 12 divisors (see below), whose sum is σ = 9722232. Its totient is φ = 4398000.

The previous prime is 6663869. The next prime is 6663893. The reversal of 6663879 is 9783666.

It is not a de Polignac number, because 6663879 - 2⁴ = 6663863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2757 + ... + 4574.

It is an arithmetic number, because the mean of its divisors is an integer number (810186).

Almost surely, 2^6663879 is an apocalyptic number.

6663879 is a deficient number, since it is larger than the sum of its proper divisors (3058353).

6663879 is a wasteful number, since it uses less digits than its factorization.

6663879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438 (or 7435 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 6663879 is about 2581.4490116987. The cubic root of 6663879 is about 188.1809691712.

The spelling of 6663879 in words is "six million, six hundred sixty-three thousand, eight hundred seventy-nine".