6664401 has 12 divisors (see below), whose sum is σ = 9713028. Its totient is φ = 4402944.

The previous prime is 6664387. The next prime is 6664417. The reversal of 6664401 is 1044666.

It can be written as a sum of positive squares in 2 ways, for example, as 904401 + 5760000 = 951^2 + 2400^2 .

It is not a de Polignac number, because 6664401 - 2¹¹ = 6662353 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2260 + ... + 4293.

It is an arithmetic number, because the mean of its divisors is an integer number (809419).

Almost surely, 2^6664401 is an apocalyptic number.

It is an amenable number.

6664401 is a deficient number, since it is larger than the sum of its proper divisors (3048627).

6664401 is a wasteful number, since it uses less digits than its factorization.

6664401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672 (or 6669 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6664401 is about 2581.5501157250. The cubic root of 6664401 is about 188.1858826208.

The spelling of 6664401 in words is "six million, six hundred sixty-four thousand, four hundred one".