6666491 has 8 divisors (see below), whose sum is σ = 7427280. Its totient is φ = 5941152.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666491 is 1946666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6666491 - 2² = 6666487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8465 + ... + 9218.

It is an arithmetic number, because the mean of its divisors is an integer number (928410).

Almost surely, 2^6666491 is an apocalyptic number.

6666491 is a deficient number, since it is larger than the sum of its proper divisors (760789).

6666491 is a wasteful number, since it uses less digits than its factorization.

6666491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17725.

The product of its digits is 46656, while the sum is 38.

The square root of 6666491 is about 2581.9548795438. The cubic root of 6666491 is about 188.2055526751.

The spelling of 6666491 in words is "six million, six hundred sixty-six thousand, four hundred ninety-one".