6664471 has 4 divisors (see below), whose sum is σ = 7270344. Its totient is φ = 6058600.

The previous prime is 6664453. The next prime is 6664481. The reversal of 6664471 is 1744666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6664471 is a prime.

It is a super-3 number, since 3×6664471³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

6664471 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664481) 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, 302920 + ... + 302941.

It is an arithmetic number, because the mean of its divisors is an integer number (1817586).

Almost surely, 2^6664471 is an apocalyptic number.

6664471 is a deficient number, since it is larger than the sum of its proper divisors (605873).

6664471 is a wasteful number, since it uses less digits than its factorization.

6664471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605872.

The product of its digits is 24192, while the sum is 34.

The square root of 6664471 is about 2581.5636734352. The cubic root of 6664471 is about 188.1865414930.

The spelling of 6664471 in words is "six million, six hundred sixty-four thousand, four hundred seventy-one".