16643345 has 8 divisors (see below), whose sum is σ = 20013480. Its totient is φ = 13287040.

The previous prime is 16643339. The next prime is 16643351. The reversal of 16643345 is 54334661.

It is an interprime number because it is at equal distance from previous prime (16643339) and next prime (16643351).

It can be written as a sum of positive squares in 4 ways, for example, as 394384 + 16248961 = 628^2 + 4031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16643345 - 2⁶ = 16643281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590 + ... + 5799.

It is an arithmetic number, because the mean of its divisors is an integer number (2501685).

Almost surely, 2^16643345 is an apocalyptic number.

It is an amenable number.

16643345 is a deficient number, since it is larger than the sum of its proper divisors (3370135).

16643345 is an equidigital number, since it uses as much as digits as its factorization.

16643345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6915.

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

The square root of 16643345 is about 4079.6255955663. The cubic root of 16643345 is about 255.3172777609.

The spelling of 16643345 in words is "sixteen million, six hundred forty-three thousand, three hundred forty-five".