16805645 has 8 divisors (see below), whose sum is σ = 20862360. Its totient is φ = 12980800.

The previous prime is 16805609. The next prime is 16805651. The reversal of 16805645 is 54650861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3844 + 16801801 = 62^2 + 4099^2 .

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

It is not a de Polignac number, because 16805645 - 2¹⁰ = 16804621 is a prime.

It is a super-3 number, since 3×16805645³ (a number of 23 digits) contains 333 as substring.

It is a congruent 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, 57806 + ... + 58095.

It is an arithmetic number, because the mean of its divisors is an integer number (2607795).

Almost surely, 2^16805645 is an apocalyptic number.

It is an amenable number.

16805645 is a deficient number, since it is larger than the sum of its proper divisors (4056715).

16805645 is a wasteful number, since it uses less digits than its factorization.

16805645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115935.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 16805645 is about 4099.4688680364. The cubic root of 16805645 is about 256.1445157748.

The spelling of 16805645 in words is "sixteen million, eight hundred five thousand, six hundred forty-five".