16643453 has 2 divisors, whose sum is σ = 16643454. Its totient is φ = 16643452.

The previous prime is 16643447. The next prime is 16643479. The reversal of 16643453 is 35434661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10582009 + 6061444 = 3253^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 16643453 - 2¹⁰ = 16642429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16643353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321726 + 8321727.

It is an arithmetic number, because the mean of its divisors is an integer number (8321727).

Almost surely, 2^16643453 is an apocalyptic number.

It is an amenable number.

16643453 is a deficient number, since it is larger than the sum of its proper divisors (1).

16643453 is an equidigital number, since it uses as much as digits as its factorization.

16643453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 32.

The square root of 16643453 is about 4079.6388320536. The cubic root of 16643453 is about 255.3178300178.

The spelling of 16643453 in words is "sixteen million, six hundred forty-three thousand, four hundred fifty-three".