16644149 has 2 divisors, whose sum is σ = 16644150. Its totient is φ = 16644148.

The previous prime is 16644137. The next prime is 16644151. The reversal of 16644149 is 94144661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 184900 = 4057^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 16644149 - 2¹⁶ = 16578613 is a prime.

Together with 16644151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16644119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322074 + 8322075.

It is an arithmetic number, because the mean of its divisors is an integer number (8322075).

Almost surely, 2^16644149 is an apocalyptic number.

It is an amenable number.

16644149 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644149 is an equidigital number, since it uses as much as digits as its factorization.

16644149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 16644149 is about 4079.7241328306. The cubic root of 16644149 is about 255.3213889494.

The spelling of 16644149 in words is "sixteen million, six hundred forty-four thousand, one hundred forty-nine".