6658979 has 4 divisors (see below), whose sum is σ = 6696360. Its totient is φ = 6621600.

The previous prime is 6658969. The next prime is 6658997. The reversal of 6658979 is 9798566.

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 6658979 - 2⁸ = 6658723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6658909) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18422 + ... + 18779.

It is an arithmetic number, because the mean of its divisors is an integer number (1674090).

Almost surely, 2^6658979 is an apocalyptic number.

6658979 is a deficient number, since it is larger than the sum of its proper divisors (37381).

6658979 is a wasteful number, since it uses less digits than its factorization.

6658979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37380.

The product of its digits is 816480, while the sum is 50.

The square root of 6658979 is about 2580.4997577989. The cubic root of 6658979 is about 188.1348342375.

The spelling of 6658979 in words is "six million, six hundred fifty-eight thousand, nine hundred seventy-nine".