6664663 has 8 divisors (see below), whose sum is σ = 7085232. Its totient is φ = 6247296.

The previous prime is 6664661. The next prime is 6664667. The reversal of 6664663 is 3664666.

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

It is not a de Polignac number, because 6664663 - 2¹ = 6664661 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 (6664661) 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, 4581 + ... + 5857.

It is an arithmetic number, because the mean of its divisors is an integer number (885654).

Almost surely, 2^6664663 is an apocalyptic number.

6664663 is a deficient number, since it is larger than the sum of its proper divisors (420569).

6664663 is a wasteful number, since it uses less digits than its factorization.

6664663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its digits is 93312, while the sum is 37.

The square root of 6664663 is about 2581.6008599317. The cubic root of 6664663 is about 188.1883486617.

It can be divided in two parts, 666 and 4663, that added together give a square (5329 = 73²).

The spelling of 6664663 in words is "six million, six hundred sixty-four thousand, six hundred sixty-three".