6644455 has 4 divisors (see below), whose sum is σ = 7973352. Its totient is φ = 5315560.

The previous prime is 6644441. The next prime is 6644459. The reversal of 6644455 is 5544466.

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

It is not a de Polignac number, because 6644455 - 2⁷ = 6644327 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6644455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664441 + ... + 664450.

It is an arithmetic number, because the mean of its divisors is an integer number (1993338).

Almost surely, 2^6644455 is an apocalyptic number.

6644455 is a deficient number, since it is larger than the sum of its proper divisors (1328897).

6644455 is a wasteful number, since it uses less digits than its factorization.

6644455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328896.

The product of its digits is 57600, while the sum is 34.

The square root of 6644455 is about 2577.6840380466. The cubic root of 6644455 is about 187.9979534257.

It can be divided in two parts, 66 and 44455, that added together give a square (44521 = 211²).

The spelling of 6644455 in words is "six million, six hundred forty-four thousand, four hundred fifty-five".