6678661 has 4 divisors (see below), whose sum is σ = 7285824. Its totient is φ = 6071500.

The previous prime is 6678647. The next prime is 6678667. The reversal of 6678661 is 1668766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6678661 - 2⁵ = 6678629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6678667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303565 + ... + 303586.

It is an arithmetic number, because the mean of its divisors is an integer number (1821456).

Almost surely, 2^6678661 is an apocalyptic number.

It is an amenable number.

6678661 is a deficient number, since it is larger than the sum of its proper divisors (607163).

6678661 is a wasteful number, since it uses less digits than its factorization.

6678661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607162.

The product of its digits is 72576, while the sum is 40.

The square root of 6678661 is about 2584.3105463547. The cubic root of 6678661 is about 188.3200091513.

The spelling of 6678661 in words is "six million, six hundred seventy-eight thousand, six hundred sixty-one".