6666787 has 4 divisors (see below), whose sum is σ = 6692400. Its totient is φ = 6641176.

The previous prime is 6666769. The next prime is 6666791. The reversal of 6666787 is 7876666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6666787 - 2¹¹ = 6664739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12412 + ... + 12937.

It is an arithmetic number, because the mean of its divisors is an integer number (1673100).

Almost surely, 2^6666787 is an apocalyptic number.

6666787 is a deficient number, since it is larger than the sum of its proper divisors (25613).

6666787 is a wasteful number, since it uses less digits than its factorization.

6666787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25612.

The product of its digits is 508032, while the sum is 46.

The square root of 6666787 is about 2582.0121998163. The cubic root of 6666787 is about 188.2083381494.

The spelling of 6666787 in words is "six million, six hundred sixty-six thousand, seven hundred eighty-seven".