6444661 has 4 divisors (see below), whose sum is σ = 6456672. Its totient is φ = 6432652.

The previous prime is 6444653. The next prime is 6444671. The reversal of 6444661 is 1664446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6444661 - 2³ = 6444653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

6444661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444601) 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, 5161 + ... + 6286.

It is an arithmetic number, because the mean of its divisors is an integer number (1614168).

Almost surely, 2^6444661 is an apocalyptic number.

It is an amenable number.

6444661 is a deficient number, since it is larger than the sum of its proper divisors (12011).

6444661 is a wasteful number, since it uses less digits than its factorization.

6444661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12010.

The product of its digits is 13824, while the sum is 31.

The square root of 6444661 is about 2538.6336876359. The cubic root of 6444661 is about 186.0944234800.

The spelling of 6444661 in words is "six million, four hundred forty-four thousand, six hundred sixty-one".