6644161 has 8 divisors (see below), whose sum is σ = 7278120. Its totient is φ = 6037248.

The previous prime is 6644159. The next prime is 6644177. The reversal of 6644161 is 1614466.

It can be written as a sum of positive squares in 4 ways, for example, as 2421136 + 4223025 = 1556^2 + 2055^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6644161 - 2¹ = 6644159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6644101) 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, 6246 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (909765).

Almost surely, 2^6644161 is an apocalyptic number.

It is an amenable number.

6644161 is a deficient number, since it is larger than the sum of its proper divisors (633959).

6644161 is a wasteful number, since it uses less digits than its factorization.

6644161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13523.

The product of its digits is 3456, while the sum is 28.

The square root of 6644161 is about 2577.6270094798. The cubic root of 6644161 is about 187.9951805766.

The spelling of 6644161 in words is "six million, six hundred forty-four thousand, one hundred sixty-one".