16644373 has 2 divisors, whose sum is σ = 16644374. Its totient is φ = 16644372.

The previous prime is 16644371. The next prime is 16644391. The reversal of 16644373 is 37344661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 3849444 = 3577^2 + 1962^2 .

It is a cyclic number.

It is not a de Polignac number, because 16644373 - 2¹ = 16644371 is a prime.

Together with 16644371, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16644371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322186 + 8322187.

It is an arithmetic number, because the mean of its divisors is an integer number (8322187).

Almost surely, 2^16644373 is an apocalyptic number.

It is an amenable number.

16644373 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644373 is an equidigital number, since it uses as much as digits as its factorization.

16644373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 34.

The square root of 16644373 is about 4079.7515855748. The cubic root of 16644373 is about 255.3225343315.

The spelling of 16644373 in words is "sixteen million, six hundred forty-four thousand, three hundred seventy-three".