16644253 has 2 divisors, whose sum is σ = 16644254. Its totient is φ = 16644252.

The previous prime is 16644233. The next prime is 16644259. The reversal of 16644253 is 35244661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 3992004 = 3557^2 + 1998^2 .

It is a cyclic number.

It is not a de Polignac number, because 16644253 - 2²¹ = 14547101 is a prime.

It is equal to p_1069861 and since 16644253 and 1069861 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16644259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322126 + 8322127.

It is an arithmetic number, because the mean of its divisors is an integer number (8322127).

Almost surely, 2^16644253 is an apocalyptic number.

It is an amenable number.

16644253 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644253 is an equidigital number, since it uses as much as digits as its factorization.

16644253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 16644253 is about 4079.7368787705. The cubic root of 16644253 is about 255.3219207352.

The spelling of 16644253 in words is "sixteen million, six hundred forty-four thousand, two hundred fifty-three".