16644271 has 6 divisors (see below), whose sum is σ = 19361760. Its totient is φ = 14266476.

The previous prime is 16644269. The next prime is 16644281. The reversal of 16644271 is 17244661.

It is not a de Polignac number, because 16644271 - 2¹ = 16644269 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 (16644211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169791 + ... + 169888.

It is an arithmetic number, because the mean of its divisors is an integer number (3226960).

Almost surely, 2^16644271 is an apocalyptic number.

16644271 is a deficient number, since it is larger than the sum of its proper divisors (2717489).

16644271 is an equidigital number, since it uses as much as digits as its factorization.

16644271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339693 (or 339686 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 16644271 is about 4079.7390847945. The cubic root of 16644271 is about 255.3220127749.

The spelling of 16644271 in words is "sixteen million, six hundred forty-four thousand, two hundred seventy-one".