6666579 has 18 divisors (see below), whose sum is σ = 9833460. Its totient is φ = 4351968.

The previous prime is 6666577. The next prime is 6666589. The reversal of 6666579 is 9756666.

It is not a de Polignac number, because 6666579 - 2¹ = 6666577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6666577) 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 17 ways as a sum of consecutive naturals, for example, 47892 + ... + 48030.

Almost surely, 2^6666579 is an apocalyptic number.

6666579 is a deficient number, since it is larger than the sum of its proper divisors (3166881).

6666579 is a wasteful number, since it uses less digits than its factorization.

6666579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 215 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 6666579 is about 2581.9719208388. The cubic root of 6666579 is about 188.2063807977.

It can be divided in two parts, 666657 and 9, that added together give a palindrome (666666).

The spelling of 6666579 in words is "six million, six hundred sixty-six thousand, five hundred seventy-nine".