16645493 has 4 divisors (see below), whose sum is σ = 16927680. Its totient is φ = 16363308.

The previous prime is 16645487. The next prime is 16645513. The reversal of 16645493 is 39454661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16645493 - 2⁴ = 16645477 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 (16645483) 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 in 3 ways as a sum of consecutive naturals, for example, 141005 + ... + 141122.

It is an arithmetic number, because the mean of its divisors is an integer number (4231920).

Almost surely, 2^16645493 is an apocalyptic number.

It is an amenable number.

16645493 is a deficient number, since it is larger than the sum of its proper divisors (282187).

16645493 is an equidigital number, since it uses as much as digits as its factorization.

16645493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282186.

The product of its digits is 77760, while the sum is 38.

The square root of 16645493 is about 4079.8888465251. Note that the first 4 decimals coincide. The cubic root of 16645493 is about 255.3282610883.

The spelling of 16645493 in words is "sixteen million, six hundred forty-five thousand, four hundred ninety-three".